Stratno | Stratigraphic Name | Category | Contents | Last update 
26292|Apamurra Member|Name source|From Apamurra Bore, Everard 1:250 000 map sheet, grid reference (6450 6110).|16-MAY-23
26292|Apamurra Member|Unit history|Formerly part of the Mount Johns Conglomerate of Krieg (1973).|16-MAY-23
26292|Apamurra Member|Type section locality|On the southeastern margin of the Mount Johns Range (Section 10). Grid reference 34929856-34919854.|16-MAY-23
26292|Apamurra Member|Extent|Along the southern and eastern margin of the Mount Johns Range.|16-MAY-23
26292|Apamurra Member|Thickness range|15.5 m at the Type Section, thins to 0 m on the northern margin of the Mount Johns Range. Thickens southwards to 48 m in Byilkaoora-1.|16-MAY-23
26292|Apamurra Member|Lithology|Red-brown dolomitic fine sandstone, siltstone and claystone. Very thinly bedded to moderately bedded.|16-MAY-23
26292|Apamurra Member|Relationships and boundaries|It occurs within and overlies the conglomerates and sandstones of Mount Johns Conglomerate. Sharply overlain in the south by the Trainor Hill Sandstone.|16-MAY-23
26292|Apamurra Member|Age reasons|No direct age even though the finer sediments contain trilobite trace fossils. Occurs between the Early-?Middle Cambrian Observatory Hill Beds and the ?Early Ordovician Mount Chandler Sandstone. May be Middle-Late Cambarian.|16-MAY-23
24165|Arkaba Hill Beds|Name source|Arkaba Hill; grid reference 648725ON, 263250E Parachilna 1:250 000 sheet area.|16-MAY-23
24165|Arkaba Hill Beds|Type section locality|242 m thick; strata overturned.  A line SE-NW from the ridge top, to the valley floor adjacent to the contact of the intrusion, 350 m southwest of Pointy Hill.|16-MAY-23
24165|Arkaba Hill Beds|Extent|The type area is a 2170 x 850 m xenoclast in the Arkaba Breccia Intrusion, that is exposed in an arc from 1 km west, through to 1 km north of Arkaba Homestead. The Beds are also recognised in numerous xenoclasts throughout the Arkaba and other breccia intrusions of the Flinders Ranges.|16-MAY-23
24165|Arkaba Hill Beds|Thickness range|242 m; i.e. Beds limited by margin of xenoclast.|16-MAY-23
24165|Arkaba Hill Beds|Lithology|60 m of red-brown weathered, greenish-grey, finely laminated, part ferruginous and calcareous, siliceous argillite at the base are overlain by interlaminated to interbedded thin silty ferroan dolostones with light greenish grey or blue grey siltstones of shales, some with casts of halite crystal impressions. Some beds grade to massive metadolostone; very fine, light grey, with scattered laminae of dark-weathered arkosic sand. Top unit is a suite of interbedded laminated pale blue-green, light blue, light green, and pale grey, part dolomitic, siliceous metasiltstones with ferroan metadolostones. Grade to thin bedded, some massive or flaggy, light grey dolostones with fine arkosic sand laminae, chert nodules, heavy-mineral lamination, fine current cross-lamination and laminar stromatolites.|16-MAY-23
24165|Arkaba Hill Beds|Relationships and boundaries|As the type area is a xenoclast in an intrusion, stratigraphic relationships can never be traced directly to other areas. Boundary of the Type Area is the margin of the xenoclast which is tectonic in origin.|16-MAY-23
24165|Arkaba Hill Beds|Age reasons|Older than the lowest host strata to the Arkaba Intrusion: i.e. pre-Sturtian. Younger than pre-Adelaidean crystalline basement. Probably Willouran (see Mount, 1975).|16-MAY-23
28228|Byilkaoora Formation|Name source|From Mount Byilkaoora, Everard 1:250 000 map sheet, grid reference (6705, 6110).|16-MAY-23
28228|Byilkaoora Formation|Unit history|Formerly part of Krieg's (1973) Mount Johns Conglomerate.|16-MAY-23
28228|Byilkaoora Formation|Type section locality|Located on the northern margin of the Mount Johns Range (Section 19). Grid reference 34229966-34229964.|16-MAY-23
28228|Byilkaoora Formation|Extent|On the northern and eastern margin of the Mount Johns Range.|16-MAY-23
28228|Byilkaoora Formation|Thickness range|35 m at Mount Byilkaoora, 22 m (Section 18) west of Mount Johns Bore and 17.5 m at the Type Section.|16-MAY-23
28228|Byilkaoora Formation|Lithology|Basal pebble to boulder conglomerate (in the north) and overlying and inter-tonguing white cross-bedded kaolinitic sandstone. Clasts include grey feldspathic sandstone, light blue fine quartzite sandstone, and veined quartzite.|16-MAY-23
28228|Byilkaoora Formation|Relationships and boundaries|Sharply and unconformably overlies the Trainor Hill Sandstone (of the Marla Group). Forms the base of the Munda Sequence. A sharp upper boundary with the Mount Chandler Sandstone in the north. A transitional upper boundary to the south.|16-MAY-23
28228|Byilkaoora Formation|Age reasons|No direct age. By correlation of the Mount Chandler Sandstone with the Pacoota Sandstone of the Amadeus Basin, a latest Cambrian to Early Ordovician age is indicated.|16-MAY-23
28228|Byilkaoora Formation|Comments|Defined P207|16-MAY-23
25885|Duff Creek Beds|Name source|Duff Creek R.S. on the Central Australia Railway, Warrina 1:100 000 sheet area, Warrina 1:250 000 sheet area. Metric reference is 68498500, 583730.|16-MAY-23
25885|Duff Creek Beds|Type section locality|The type section is defined by two separate sections totalling 5500 m in thickness. The upper part of the type section (3700 m) occurs east of Nilpinna H.S. and is defined by metric refs: base 6847600, 595050 - top 6849025, 591660. The lower 1800 m of the type sequence outcrops 9 km to the south and is defined by metric refs; base 6838350, 593700 - top 6841090, 592960.|16-MAY-23
25885|Duff Creek Beds|Extent|Outcrops in several thick sequences on the eastern margin of the Peake and Denison Ranges, east and south of Nilpinna H.S. and in a faulted sequence 7 km southeast of "Peake" ruins and immediately east of Mount Kingston. Other faulted blocks containing Duff Creek Beds occur west of Tarlton Springs, 5.5 km northwest of Douglas Well, immediately west and southwest of Mount Younghusband and one kilometre south of Mount Dutton.|16-MAY-23
25885|Duff Creek Beds|Thickness range|Maximum true thickness is uncertain. Thickest development of sediments (5500 m) is in the type section.|16-MAY-23
25885|Duff Creek Beds|Lithology|Laminated olive green silty shales and thin arkose interbeds, flaggy buff, weathering pale grey and yellow dolomites, minor dark grey dolomite, flaggy dolomitic siltstone, laminated pyritic fine sandstone, minor quartzitic sandstone; mudcracks, ripples, clay galls and crossbedding are common; horizons with abundant salt casts and gypsum casts; algal laminations.|16-MAY-23
25885|Duff Creek Beds|Relationships and boundaries|Exhibits faulted contacts with underlying and overlying sequences. Believed to grade downwards into the Nilpinna Beds and upwards into the Murrana Beds (Ambrose and Flint, in prep.) although all contacts with these units are sheared. Lithological affinities and spatial distribution of outcrops support this view.|16-MAY-23
25885|Duff Creek Beds|Age reasons|Lower Adelaidean (Willouran or Torrensian). Probably intervenes between the Nilpinna Beds and Murrana Beds (Ambrose and Flint, in prep.). NB. Reyner (1955) defined the Duff Creek Formation to include all Willouran rocks in the Peake and Denison Ranges.|16-MAY-23
25885|Duff Creek Beds|Proposed publication|Rep. Invest. Geol. Surv. S. Aust.|16-MAY-23
25885|Duff Creek Beds|Status|1|16-MAY-23
6187|Engenina Adamellite|Name source|Engenina Creek which drains northwards into Lake Cadibarrawirracanna.|16-MAY-23
6187|Engenina Adamellite|Type section locality|Type area 7 km northeast of Hat View, bounded by latitudes 29o30' and 29o31'S and longitudes 135o15'30" 135o16'15"E.|16-MAY-23
6187|Engenina Adamellite|Extent|The unit is exposed over 35 km2 in the northwestern portion of the Billa Kalina 1:250 000 sheet area (SH53-7), between the headwaters of Balta Baltana and Engenina Creeks.|16-MAY-23
6187|Engenina Adamellite|Lithology|Dominantly adamellite, also granite and granodiorite; grey, porphyritic and foliated. Tabular to ovoid feldspar phenocrysts 20 mm across, aligned subparallel to the foliation.|16-MAY-23
6187|Engenina Adamellite|Relationships and boundaries|Intrudes unnamed metamorphics of assumed Archaean to Early Proterozoic age. Overlain by Cretaceous sediments of the Mount Anna Sandstone.|16-MAY-23
6187|Engenina Adamellite|Age reasons|Six total rock samples yielded a Model 1 Rb/Sr isochron of 1641+/-38 Ma and an initial Sr87/Sr86 ratio of 0.7081. Decay constant used was Rb87 = 1.42 x 10-11 yr-1. (Webb, 1977). The age is therefore Middle Proterozoic.|16-MAY-23
6187|Engenina Adamellite|Resdate|MAY/JUN 1977|16-MAY-23
26304|Fountain Spring Beds|Name source|Fountain Spring on the plains abutting the eastern margin of the Peake and Denison Ranges, 43 km east of Edwards Creek R.S. on the Central Australia Railway. Umbum 1:100 000 sheet area, Warrina 1:250 000 sheet area. Metric ref: 6863290, 625690.|16-MAY-23
26304|Fountain Spring Beds|Type section locality|1100 metres of sediments occur in the type section 3 km north of Mount Margaret, metric reference base 6853033, 603590 - top 6852020, 603590.|16-MAY-23
26304|Fountain Spring Beds|Extent|Outcrops solely on the middle-eastern and north western margins of the Margaret Inlier in the Peake and Denison Ranges.|16-MAY-23
26304|Fountain Spring Beds|Thickness range|Maximum true thickness is uncertain. Thickest development of sediments (1100 m) is in the type section.|16-MAY-23
26304|Fountain Spring Beds|Lithology|Laminated grey dolomitic siltstone and interbedded thick grey quartzites with clay gall laminations, grey-green silty shale (salt casts); ;minor grey silty dolomite and a few quartzites near the base.|16-MAY-23
26304|Fountain Spring Beds|Relationships and boundaries|Grades upwards into the Mount Margaret Quartzite (Ambrose and Flint, in prep.) the contact being marked by an increase in orthoquartzites. The lower contact is tectonic although the un;it probably grades downwards into an unnamed siltstone with which it has many lithological affinities (Ambrose and Flint, in prep.).|16-MAY-23
26304|Fountain Spring Beds|Age reasons|Adelaidean - Burra Group (Torrensian); considered equivalent to the River Wakefield Subgroup (Forbes, 1964); grades upwards into the Mount Margaret Quartzite.|16-MAY-23
26304|Fountain Spring Beds|Proposed publication|Rep. Invest., Geol. Surv. S. Aust.|16-MAY-23
26304|Fountain Spring Beds|Resdate|29-NOV-1979|16-MAY-23
12224|Moonamby dyke-suite|Name source|Intrusive dykes, comagmatic with the Hiltaba Granite (Blissett). B25 From Moonamby well on Kakatha station, which adjoins Lake Everard station. Moonamby well is within the mapped area and is located at 31o34' latitude and 135o30.25' longitude.|16-MAY-23
12224|Moonamby dyke-suite|Type section locality|Not applicable as the dykes are narrow, variable and numerous.|16-MAY-23
12224|Moonamby dyke-suite|Extent|A series of coarse-grained acid dykes confined almost entirely to the south-eastern portion of the Childara 1:250 000 Sheet area, but extending onto the far western portion of the Gairdner 1:250 000 Sheet area.|16-MAY-23
12224|Moonamby dyke-suite|Lithology|The dykes are invariably a brick red colour and porphyritic with coarse grained phenocrysts of quartz and K feldspar sitting in an aphanitic groundmass. Although co-magmatic and in close proximity to each other, in detail the textural and mineralogical features of the dykes are distinct. Some dykes contain modal quartz others do not. In general the amount of modal quartz is inversely proportional to the amount of modal chlorite which is scattered throughout as fine to medium grained clusters. In thin section the K feldspar forms individual coarse grained, euhedral phenocrysts and coarse-grained glomeroporphyritic aggregates. Microcline is often present as indicated by its characteristic "cross-hatching" effect. Plagioclase phenocrysts are present. The quartz phenocrysts are usually medium-fine grained and always anhedral in shape. The chlorite is clearly replacing original clinopyroxene. Phenocrysts usually make up 30-45% of the rock. The groundmass shows variable textures from granophyric, to microgranular to spherulitic. Invariably much limonite is scattered throughout the groundmass, giving the dykes their characteristic red colour. The dykes outcrop as rounded tors.|16-MAY-23
12224|Moonamby dyke-suite|Relationships and boundaries|The dykes intrude all units exposed in the western part of the Glyde Hill Complex and therefore post-date all the volcanic units exposed in the Glyde Hill Complex. The dykes are considered to originate from the co-magmatic Hiltaba Granite ( Blissett) which outcrops extensively to the south. The dykes vary in width from 10 to 80 m.|16-MAY-23
12224|Moonamby dyke-suite|Age reasons|Post-date all volcanic units in the Glyde Hill Complex as defined by Blissett, but are considered to be co-magmatic and intruded at the same time as the nearby Hiltaba Granite (Blissett). Age mid-Carpentarian, roughly 1510 Ma from geochronology.|16-MAY-23
12224|Moonamby dyke-suite|Proposed publication|SA Department of Mines, Quarterly Notes No. 61|16-MAY-23
12224|Moonamby dyke-suite|Unit name|Moonamby Dyke-suite|16-MAY-23
25734|Mount Johns Conglomerate|Name source|Mount Johns, Everard 1:250 000 map sheet, grid reference (6606 6283).|16-MAY-23
25734|Mount Johns Conglomerate|Unit history|Krieg's (1972) Mount Johns Conglomerate, encompassed all the conglomerates, outcropping on the northern flank of the Mount Johns Range. Here the name is restricted to those occurring between the Trainor Hill Sandstone (redefined) and the Arcoeillinna Sandstone (new name).|16-MAY-23
25734|Mount Johns Conglomerate|Type section locality|On the northeastern margin of the Mount Johns Range.|16-MAY-23
25734|Mount Johns Conglomerate|Extent|Along the north and eastern margins of the Mount Johns Range.|16-MAY-23
25734|Mount Johns Conglomerate|Thickness range|78 m (section 13) on the northern margin of the Mount Johns Range to 1.5 m (in Byilkaoora-1) in the southeast.|16-MAY-23
25734|Mount Johns Conglomerate|Lithology|Red-brown feldspathic sandstone, conglomeratic in part, with pebble to boulder conglomerate at the base. Clasts are well rounded coarse feldspathic sandstone, quartzite, pegmatite, quartz, pebbles to boulders, pebbles of red, brown, yellow, white siltstone and claystone.|16-MAY-23
25734|Mount Johns Conglomerate|Relationships and boundaries|Sharply overlies the Arcoeillina Sandstone. (Inter-trongues with the Apamurra Member) sharply overlain by the Trainor Hill Sandstone in the south by a gradational boundary in the north).|16-MAY-23
25734|Mount Johns Conglomerate|Age reasons|No direct evidence. Occurs between the Early-?Middle Cambrian Observatory Hill Beds and the ?Early Ordovician Mount Chandler Sandstone.|16-MAY-23
25734|Mount Johns Conglomerate|Proposed publication|Trans. Roy. Soc. South Australia|16-MAY-23
24406|Moyles Chert Marker|Name source|Moyles Dam, latitude 27o28'30"S, longitude 133o20'15"E) on Wantapella 1:100 000 Sheet.|16-MAY-23
24406|Moyles Chert Marker|Type section locality|Byilkaoora 1 from 200.1 m to 213.1 m.|16-MAY-23
24406|Moyles Chert Marker|Extent|Mount Johns area, in subsurface, remnants of this marker occur at the Observatory Hill Formation type section.|16-MAY-23
24406|Moyles Chert Marker|Thickness range|13 m in the type section, it varies from 8 to 28 m.|16-MAY-23
24406|Moyles Chert Marker|Lithology|Limestone, dolomite, and siltstone with abundant chert nodules and fragments.|16-MAY-23
24406|Moyles Chert Marker|Relationships and boundaries|Within the Observatory Hill Formation it occurs above the Parakeelya Alkali Member and beneath the Oolarinna Member.|16-MAY-23
24406|Moyles Chert Marker|Age reasons|Younger than the Early Cambrian Ouldburra Formation and older than Late Cambrian-Devonian (Krieg, 1973).|16-MAY-23
24406|Moyles Chert Marker|Defn author|Brewer A.M. 87/25860.  Revision. Mention 53. Defined p6 as MCM Bed, Dewster J.N., Gatehouse C.G., Henry R.L., Weste B.|16-MAY-23
24406|Moyles Chert Marker|Proposed publication|Quarterly Geological Notes 102|16-MAY-23
24406|Moyles Chert Marker|Defn approved by|Photocopy sent by N.F. Alley, Conv. SA Sub-Committee |16-MAY-23
24406|Moyles Chert Marker|Proposer|Brewer A.M.|16-MAY-23
24411|Murrana Beds|Name source|Murra Murrana bore situated on the southrn margin of the Denison Inlier in the Peake and Denison Ranges, 5 km northeast of Peake H.S. (metric reference 6878480, 593250); Warrina 1:100 000 Sheet area; Warrina 1:250 000 Sheet area.|16-MAY-23
24411|Murrana Beds|Type section locality|Comprises 2900 m of sediments outcropping on the eastern limb of a basinal syncline 4 km northwest of Warrina R.S. Metric reference of the base of the section is 6885100, 587650; of the top 6885680, 581290. Contacts at the base and top of the section are tectonic.|16-MAY-23
24411|Murrana Beds|Extent|Outcrops in a basinal syncline 4 km northwest of Warrina R.S., constitutes most of Mount Dutton Inlier; outcrops in a faulted sequence 1 km east of Nilpinna H.S.|16-MAY-23
24411|Murrana Beds|Thickness range|Maximum true thickness is uncertain. Thickest development of sediments (2900 m) is in the type section.|16-MAY-23
24411|Murrana Beds|Lithology|Laminated gritty quartzitic sandstone, grey-green silty shale interbeds; arkose, pebbly dolomite, purple and grey silty shale near the top; ripplemarks, mudcracks, cross laminations, flute casts and salt casts.|16-MAY-23
24411|Murrana Beds|Relationships and boundaries|Nature of overlying sequences is uncertain. The unit is often faulted at the base against Duff Creek Beds. (Ambrose and Flint, in prep.). Lithological affinities with the Duff Creek Beds suggest a gradational contact between the two units although this has not been observed intact in the field.|16-MAY-23
24411|Murrana Beds|Age reasons|Lower Adelaidean (Willouran or Torrensian). The unit probably grades down into the Duff Creek Beds.|16-MAY-23
24411|Murrana Beds|Proposed publication|Rep. Invest. Geological Survey SA|16-MAY-23
24411|Murrana Beds|Proposer|Ambrose G.J.|16-MAY-23
24411|Murrana Beds|Resdate|29-NOV-1979|16-MAY-23
26317|Nankabunyana Formation|Name source|"Nankabunyana" well; latitude 30o34'53"S, longitude 138o15'46"E, on the Copley 1:250 000 sheet area (SH 54-9).|16-MAY-23
26317|Nankabunyana Formation|Unit history|This formation has been previously referred to as the lower unnamed member of the Skillogalee Dolomite (Coats et al. 1969).|16-MAY-23
26317|Nankabunyana Formation|Type section locality|Located 6 km southwest of Copley on the northwest side of the Aroona Dam pipeline road, from latitude 30o34'45"S, longitude 138o22'E (base), to latitude 30o34'53"S longitude 138o22'14"E (top of section), and totalling 538 m of sandstone, siltstone and dolomite. The base occurs at the introduction of siltstones above massive quartzites of the Copley Quartzite (Parkin, 1953); the top is identified by a 45 m thick unit of dark grey shale grading upwards into grey very fine-grained sandstone.|16-MAY-23
26317|Nankabunyana Formation|Extent|Copley-Myrtle Springs area, and the Arkaroola area on the Copley 1:250 000 sheet area, and in the Willouran Ranges on the Andamooka (SH 53-12), Curkimurka (SH 53-8), Marree (SH 54-5) and Copley 1:250 000 sheet areas.|16-MAY-23
26317|Nankabunyana Formation|Thickness range|130 to 713 m.|16-MAY-23
26317|Nankabunyana Formation|Lithology|Green-grey wavy laminated siltstones and shales, grey dolomitic fine-grained sandstones with some ripple cross lamination, whtie fine-grained quartzites, brown to grey dolomites, which may be micritic, or stromatolitic, and minor intraformational dolomite conglomerates.|16-MAY-23
26317|Nankabunyana Formation|Relationships and boundaries|Conformably overlies the Copley Quartzite or its lateral equivalent the Wortupa Quartzite (Coats et al. 1969) and is conformably overlain by the Yadlamalka Formation (new name to be proposed in same publication).|16-MAY-23
26317|Nankabunyana Formation|Age reasons|Position within the Burra Group which is considered as Torrensian (Thomson et al. 1964) indicates a Torrensian age.|16-MAY-23
26317|Nankabunyana Formation|Proposed publication|Transactions of the Royal Society of South Australia|16-MAY-23
26317|Nankabunyana Formation|References|01/31614|16-MAY-23
26317|Nankabunyana Formation|Proposer|Upill R.K.|16-MAY-23
24424|Nathaltee Formation|Name source|"Nathaltee Creek" on eastern margin of Port Augusta 1:250 000 Sheet area at latitude 32o16'S, longitude 137o59'E.|16-MAY-23
24424|Nathaltee Formation|Unit history|Previously referred to as the lower silty, quartzitic sequence of the Skillogalee Dolomite mapped by Binks (1971).|16-MAY-23
24424|Nathaltee Formation|Type section locality|Located 1 km south of Depot Creek in a tributary of Depot Creek within the Emeroo Range, from latitude 32o14'S longitude 137o56'40"E (base) to latitude 32o14'S longitude 137o56'50"E (top of section), and totalling 135 m of dolomite, siltstone and sandstone. Base occurs at the introduction of siltstone and dolomite above massive quartzites of the Emeroo Quartzite (Mawson, 1947), and the top is marked by an 8 m thick quartzite horizon.|16-MAY-23
24424|Nathaltee Formation|Extent|The unit is exposed in the Emeroo Range on the eastern portion of the Port Augusta 1:250 000 Sheet area (SI 53-4), in the Yednalue anticline in the north-central portion of the Orroroo 1:250 000 Sheet area (SI 54-1), and in the Port German Gorge-Beetaloo Reservoir area in the southwestern portion of the Orroroo 1:250 000 Sheet area, and northwestern portion of the Burra 1:250 000 Sheet area (SI 54-5).|16-MAY-23
24424|Nathaltee Formation|Thickness range|80 m to 645 m.|16-MAY-23
24424|Nathaltee Formation|Lithology|Grey and green-grey laminated siltstones, grey and buff dolomicrites and stromatolitic dolomites with diagenetic chert nodules, pale grey dolomitic sandstones and quartzites which may be cross bedded, and minor intraformational dolomite and magnesite conglomerates.|16-MAY-23
24424|Nathaltee Formation|Relationships and boundaries|Conformably overlies the Emeroo Quartzite or its lateral equivalent the Yednalue Quartzite, Spry (1952). Overlain conformably by the Yadlamalka Formation (new name to be proposed in same publication).|16-MAY-23
24424|Nathaltee Formation|Age reasons|Position within the Burra Group which is considered as Torrensian (Thomson et al. 1964) indicates a Torrensian age.|16-MAY-23
24424|Nathaltee Formation|Proposed publication|Transactions of the Royal Society of South Australia|16-MAY-23
24424|Nathaltee Formation|Proposer|Uppill R.K.|16-MAY-23
24424|Nathaltee Formation|Resdate|17-FEB-1978|16-MAY-23
24430|Niggly Gap Beds|Name source|Niggly Gap is the name of narrow pass between hills on the Hawker to 'Worumba' road.|16-MAY-23
24430|Niggly Gap Beds|Unit history|Referred to informally as Unit B by Preiss (1978).|16-MAY-23
24430|Niggly Gap Beds|Type section locality|A structurally uncomplicated section is chosen 1 km south of Niggly Gap, along a small stream and across three strike ridges. The section commences at 277250-6467200 and finishes at 277700-6467250.|16-MAY-23
24430|Niggly Gap Beds|Extent|Continuous along a strike length of nearly 14 km, north and south of type section. More disrupted Niggle Gap Beds occur also on the western and northern sides of the Worumba Anticline core complex. Elsewhere in the Flinders Ranges, disrupted sequences similar to the Niggle Gap Beds occur in many diapirs, e.g. Blinman (Coats, 1964), Arkaba (Mount, 1975), and Thomson Gap Diapirs, while redbed varieties occur in others, e.g. Beltana, Enorama.|16-MAY-23
24430|Niggly Gap Beds|Thickness range|In type section, 400 m of Niggle Gap Beds are exposed. Elsewhere, higher parts of the same sequence probably occur, but are of uncertain relationship to the type section. Total original thickness probably greater.|16-MAY-23
24430|Niggly Gap Beds|Lithology|Lithological Sequence in Type Section: Top: 12 m sandstone, grey, micaceous, dolomitic, platy, interbedded with siltstone, dark grey, micaceous, platy. 68 m sandstone, dark grey and pinkish grey, micaceous, platy; some bands with heavy mineral lamination, cross-bedding. Interbedded with siltstone, dark grey, micaceous, with halite casts, and including bands up to 1 cm thick of coarse detrital mica; minor quartzite, flaggy, dark grey, micaceous, with shale intraclasts. minor quartzite, flaggy, dark grey, micaceous, with shale intraclasts. 10 sandstone, grey, medium to coarse grained, lithic, feldspathic, with graded beds up to 5 cm thick. 13 m sandstone, pale grey, dolomitic, platy, medium grained, interbedded with siltstone, micaceous; sandstone, coarse grained, feldspathic, and greywacke, fine grained, extremely micaceous. 33 m siltstone, dark grey, micaceous. 4 m dolomite, pale grey, weathering brown, flaggy to blocky, well laminated. 45 m sandstone, dark grey-green, fine to medium grained, micaceous, feldspathic, interbedded with siltstone, dark grey, micaceous; interbeds 20 cm thick of quartzite, pinkish grey, coarse grained, gritty, feldspathic, cross-bedded. 20 m siltstone, dark grey, micaceous, platy, and sandstone, pale pinkish grey to blue-grey, micaceous, feldspathic, lithic; minor dolomitic sandstone. 14 m sandstone, dark grey, fine grained, flaggy, micaceous, with silty partings; siltstone, dark grey, platy, micaceous, and shale, very dark grey thin bands.  15 m siltstone, dolomitic or micaceous, platy, and dolomite, medium grey, fine sandy, flaggy, interbedded with lithic, micaceous sandstone. 16 m dolomite, pale grey, weathering buff, flaggy, laminated, interbedded siltstone, dark grey, micaceous. 29 m sandstone, blue-grey, flaggy, lithic, fine to medium grained, with silty partings, halite caasts, interbedded with siltstone, blue-grey, platy. 5 m dolomite, buff, weathering brown, well laminated, with large cumulate stromatolites up to 2 m in diameter, and authigenic quartz blebs. 75 m sandstone, pale blue-grey to pinkish grey, fine to coarse grained, lithic, feldspathic, flaggy to platy, partly dolomitic, micaceous, interbedded with siltstone, dark grey to blue-grey, micaceous, shaly, partly dolomitic. 4 m dolomite, pale grey, brown weathering, silty, flaggy. Base: 37 m siltstone, dark grey to blue-grey, micaceous, and sandstone, fine to coarse grained, micaceous platy; interbedded dolomite, pale grey, weathering brown, flaggy, silty.|16-MAY-23
24430|Niggly Gap Beds|Relationships and boundaries|In the type section, lower boundary conformaable on Wirrawilka Beds. Upper boundary remains uncertain, since Beds nowhere seen in sedimentary contact with overlying sequences. Disrupted blocks of similar lithological character have been assigned to the Niggly Gap Beds throughout the core complex. Part of this disruption occurred prior to the Sturtian, since Sturtian Holowilena Ironstone and Wilyerpa Formation unconformably overlie overturned and brecciated Niggle Gap Beds in a block at the eastern margin of the core complex west of Mount Plantagenet. Elsewhere, especially along the western margin, carbonate breccias, including blocks of disrupted Niggly Gap Beds, have intruded both Torrensian and Sturtian limb sequences. Near Morgan Creek, two large xenoclasts in intrusive breccia contain probable Niggly Gap Beds overlying basic volcanics, possibly with an erosional contact (clasts of volcanics reworked in thin basal conglomerate). These blocks together with other xenoclasts (including Tapley Hill Formation) occur in carbonate breccia that intrudes Tapley Hill Formation. In summary, the Niggly Gap beds conformably overlie Wirrawilka Beds in the type section, but to the south, the Wirrawilka Beds may have lensed out, and the Niggly Gap Beds lapped directly on to early Willouran basic volcanics.|16-MAY-23
24430|Niggly Gap Beds|Identifying features|Definition: A distinctive lithological association of micaceous siltstone and sandstone, with heavy-mineral laminations and halite casts, and minor dolomites. Map symbol Pcn.|16-MAY-23
24430|Niggly Gap Beds|Structure and Metamorphism|Form a continuous unbroken sequence only on the east limb of the Worumba Anticline (within the core complex), where they are affected by steeply plunging cross-folds. Elsewhere, severely brecciated and faulted, the fragments commonly being incorporated in carbonate breccia.|16-MAY-23
24430|Niggly Gap Beds|Age reasons|The age is inferred to be Willouran in the case of the Spalding Inlier as the equivalents of the Niggly Gap Beds occur well below the basal Torrensian Rhynie Sandstone.|16-MAY-23
24430|Niggly Gap Beds|Correlations|Correlatives of the Niggly Gap Beds occur widely in diapiric complexes of the Flinders Ranges. Very similar lithologies are also present in disrupted parts of the Spalding Inlier, possibly stratigraphically below the type section of the River Broughton Beds (Preiss, 1974). |16-MAY-23
24430|Niggly Gap Beds|Proposed publication|Quarterly Geological Notes, Geological Survey of SA, 76 : 12-23|16-MAY-23
24430|Niggly Gap Beds|Proposer|Preiss W.V.|16-MAY-23
24430|Niggly Gap Beds|Resdate|03-JUL-1979|16-MAY-23
27296|Nilpinna Beds|Name source|Nilpinna H.S. situated on the eastern margin of the Peake and Denison Ranges, 6.5 km east of Duff Creek R.S. on the Central Australia Railway; Warrina 1:100 000 sheet area, Warrina 1:250 000 sheet area. Metric reference is 6849133, 590075.|16-MAY-23
27296|Nilpinna Beds|Type section locality|2100 m of sediments in a fault bound sequence outcropping 6 km southeast of Nilpinna H.S.  The base of the section (metric ref: 6846125, 596650) is faulted against War Loan Beds and the top of the section (metric ref: 6846175, 594650) is faulted against Duff Creek Beds (Ambrose and Flint, in prep.).|16-MAY-23
27296|Nilpinna Beds|Extent|Outcrops in a west facing, fault bound sequence 1 kilometre north of War Loan Mine; metric ref: 6844733, 597225. |16-MAY-23
27296|Nilpinna Beds|Thickness range|Maximum true thickness is uncertain. The thickest development of sediments (2100 m) is in the type section.|16-MAY-23
27296|Nilpinna Beds|Lithology|Fine cross-laminated, rippled sandstones, rippled quartzites (salt casts) green-grey silty shale, minor grey silty dolomite and greenish arkose; mudcracks, ripplemarks and salt casts are common.|16-MAY-23
27296|Nilpinna Beds|Relationships and boundaries|Believed to grade downwards into the War Loan Beds and upwards into the Duff Creek Beds although all contacts with these units are sheared (Ambrose and Flint, in prep). Lithological affinities and spatial distribution of outcrops support this view.|16-MAY-23
27296|Nilpinna Beds|Age reasons|Lower Adelaidean (Willouran or Torrensian); probably intervenes between the War Loan Beds and Duff Creek Beds (Ambrose and Flint, in prep.).|16-MAY-23
27296|Nilpinna Beds|Proposed publication|Rep. Invest. Geological Survey SA|16-MAY-23
27296|Nilpinna Beds|Proposer|Ambrose G.J., Coats R.P.|16-MAY-23
27296|Nilpinna Beds|Resdate|29-NOV-1979|16-MAY-23
26081|North Maslin Sand Member|Name source|From "Maslin Beach" a coastal town, south of Adelaide|16-MAY-23
26081|North Maslin Sand Member|Type section locality|ABM Noarlunga Sand Co. Quarry at Maslin Beach and in the Canyon, a small gully along the coast in the same area.|16-MAY-23
26081|North Maslin Sand Member|Extent|Eastern side of Cainozoic St Vincent Basin|16-MAY-23
26081|North Maslin Sand Member|Thickness range|Range 0-53 m in Willunga Embayment.|16-MAY-23
26081|North Maslin Sand Member|Lithology|Fluvial quartz sands and gravels, rare clay and lignite.|16-MAY-23
26081|North Maslin Sand Member|Relationships and boundaries|The lower member of the Maslin Sands in terms of Cooper (1979). Overlies Precambrian/Cambrian sediments of Adelaide Fold Belt or Permian Cape Jervis Beds. Laterally equivalent to Clinton Formation. Overlain by South Maslin Sand or rarely by Blanche Point or Clinton Formations.|16-MAY-23
26081|North Maslin Sand Member|Age reasons|Mainly Middle Eocene but Late Eocene in some marginal areas.|16-MAY-23
26081|North Maslin Sand Member|Proposed publication|Rep. Inv. Geological Survey SA 50|16-MAY-23
26081|North Maslin Sand Member|Comments|Reynolds' use of Maslin does not adhere to the present Stratigraphic code, however the name North Maslin Sand is sufficiently entrenched in the literature not to warrant change.|16-MAY-23
26081|North Maslin Sand Member|Status|1|16-MAY-23
24474|Rockwater Beds|Name source|Rockwater Hill situated 18 km southwest of Warrina R.S. on the Central Australia Railway; Umbum 1:100 000 sheet area. Warrina 1:250 000 sheet area; metric ref: 6869200, 595510.|16-MAY-23
24474|Rockwater Beds|Type section locality|The unit only outcrops in blocks stratigraphically isolated by faulting and diapirism. The Type section is a block immediately south of Coominaree Mine on Warrina - metric ref: 6852050, 595900.|16-MAY-23
24474|Rockwater Beds|Extent|Several small outcrops occur as blocks in a diapir on the western margin of the Rockwater Hill Block (Peake Metamorphics, Ambrose and Flint, in prep.). Two small blocks outcrop on Warrina about 11 km northeast of Warrina R.S. A third block outcrops immediately south of Coominanee Mine on Warrina.|16-MAY-23
24474|Rockwater Beds|Thickness range|True maximum thickness is uncertain. The thickest section, 200 m, is in the reference section south of Coominaree Mine; metric ref: 6852050, 595900.|16-MAY-23
24474|Rockwater Beds|Lithology|Blue-grey and black chert, black dolomitic limestone, black silty shale and grey quartzite.|16-MAY-23
24474|Rockwater Beds|Relationships and boundaries|The unit is stratigraphically isolated by faulting and diapirism; thought to occur stratigraphically above the Cadlareena Volcanics and below the War Loan Beds (Ambrose and Flint, in prep.), although no contacts are observed.|16-MAY-23
24474|Rockwater Beds|Age reasons|Lower Adelaidean - it is not certain whether the unit is Willouran or Torrensian; the unit probably closely overlies the Willouran Cadlareena Volcanics (Ambrose and Flint, in prep.), although no contact is exposed; it correlates with the Dunn's Mine Beds of the Willouran Ranges (B. Murrell, personal communication) which closely overly Willouran Volcanics in that region.|16-MAY-23
24474|Rockwater Beds|Proposed publication|Rep. Invest., Geological Survey SA|16-MAY-23
24474|Rockwater Beds|Proposer|Ambrose G.J.|16-MAY-23
24474|Rockwater Beds|Resdate|29-NOV-1979|16-MAY-23
38896|Seal Point Granite Gneiss|Name source|Seal Point, south east point on Flinders Island.|16-MAY-23
38896|Seal Point Granite Gneiss|Unit history|None known.|16-MAY-23
38896|Seal Point Granite Gneiss|Geomorphic expression|None.|16-MAY-23
38896|Seal Point Granite Gneiss|Type section locality|East side Seal Point, eastern Flinders Island, 134.54659 E, -33.71875 S (GDA94).|16-MAY-23
38896|Seal Point Granite Gneiss|Description at type locality|Exposed on wave platform on east side Seal Point, mid to dark grey biotite-rich, K-feldspar-bearing quartz- plagioclase- gneiss that is fine to medium grained and quite well foliated, to pale pink weakly foliated biotite- and magnetite-bearing granitic gneiss.|16-MAY-23
38896|Seal Point Granite Gneiss|Extent|Only known outcrop is east side Seal Point, based on airmag extends to north and east.|16-MAY-23
38896|Seal Point Granite Gneiss|Lithology|Banded to massive, foliated granite gneiss.|16-MAY-23
38896|Seal Point Granite Gneiss|Depositional environment|Not known.|16-MAY-23
38896|Seal Point Granite Gneiss|Fossils|None known.|16-MAY-23
38896|Seal Point Granite Gneiss|Diastems or hiatuses|None known|16-MAY-23
38896|Seal Point Granite Gneiss|Relationships and boundaries|Is intruded by Calca Granite.|16-MAY-23
38896|Seal Point Granite Gneiss|Age reasons|1762 +/- 11 Ma by zircon U-Pb|16-MAY-23
38896|Seal Point Granite Gneiss|Proposed publication|Australian Journal of Earth Sciences|16-MAY-23
38896|Seal Point Granite Gneiss|Comments|Only surface outcrop known, sub water extent is being determined by geophysics.|16-MAY-23
17117|South Maslin Sand Member|Name source|From "Maslin Beach" a coastal town, south of Adelaide.|16-MAY-23
17117|South Maslin Sand Member|Type section locality|Coastal Cliffs of Maslin Bay from the Canyon, south towards Blanche Point. Reynolds (1953) regarded outcrop in the ABM Noarlunga Sand Quarry to be part of the type. However this outcrop is now obscured and Cooper (1979) restricted the stratotype accordingly.|16-MAY-23
17117|South Maslin Sand Member|Extent|Willunga Embayment of the St Vincent Basin and adjacent area.|16-MAY-23
17117|South Maslin Sand Member|Thickness range|0-50 m|16-MAY-23
17117|South Maslin Sand Member|Lithology|Fine and coarse quartz, glauconite sand; polished geothite pellets common.|16-MAY-23
17117|South Maslin Sand Member|Relationships and boundaries|Interfingers with underlying North Maslin Sand, overlain disconformably by Tortachilla Limestone.|16-MAY-23
17117|South Maslin Sand Member|Age reasons|Middle to Late Eocene.|16-MAY-23
17117|South Maslin Sand Member|Proposed publication|Rep. Inv. Geological Survey SA, 50.|16-MAY-23
17117|South Maslin Sand Member|Comments|Reynolds' use of Maslin does not adhere to the present Stratigraphic code, however South Maslin Sand is sufficiently entrenched in the literature not to warrant change. South Maslin Sand is the younger member of the Maslin Sands according to Cooper (1979).|16-MAY-23
17117|South Maslin Sand Member|Status|1|16-MAY-23
25696|Top Mount Sandstone Beds|Name source|Top Mount Well, ESE of 'Mount Norwest', 33 km SE of 'Callanna'. Map symbol -Pot.|16-MAY-23
25696|Top Mount Sandstone Beds|Unit history|Top Mount Sandstone' of Murrell (1977) extended downward to faulted junction with Callanna Group.|16-MAY-23
25696|Top Mount Sandstone Beds|Type section locality|Wattle Creek, downstream from Upper Wattle Well, 3 kn NE of Kingston Dam; latitude 29o55', longitude 137o58'. Subsidiary section E. of Rook workings has more sandy basal facies.|16-MAY-23
25696|Top Mount Sandstone Beds|Extent|Willouran Ranges.|16-MAY-23
25696|Top Mount Sandstone Beds|Thickness range|744 m in the type section; approximately 1 000 m E of Rook workings.|16-MAY-23
25696|Top Mount Sandstone Beds|Lithology|Lithological sequence in type section: Top - 44 m siltstone, dark grey, finely laminated, platy, with minor interbedded flaggy sandstone and grey dolomite. 81 m quartzite, sandstone and minor grey siltstone with grey dolomite and limestone; thin to medium bedded. 35 m prominent quartzite, minor shale and calcitic carbonate; thin to medium bedded. Minor dark lamination (tourmaline). 30m siltstone, sandstone and dolomite, flaggy to platy; mud cracks, halite and shortite casts; valley forming.  25 m prominent quartzite, medium to coarse grained, thin to medium bedded, wavy lamination, mud cracks. Pits after shortite are common in this unit throughout the Willouran Ranges.  314 m fine-grained dolomitic marble, shale, siltstone, sandstone and quartzite, generally poorly outcropping, thin to medium bedded; wavy lamination, ripple marks, mud cracks, lenticular bedding, ?tepee structures, occasional halite casts.  102 m quartzite, siltstone, shale; platy to medium bedded, black lamination (tourmaline), mud cracks, ripple marks.  108 m siltstone and shale, greenish grey, light greyish, laminated, thin bedded with minor dolomite; partly covered interval. Base - 5 m dolomite, talcose in some areas, yellowish brown, partly quartzitic. Overall sand:shale:carbonate percentages 50:29:21.|16-MAY-23
25696|Top Mount Sandstone Beds|Relationships and boundaries|Lower boundary faulted against brecciated Callanna Group. Conformably overlain by Willawalpa Formation.|16-MAY-23
25696|Top Mount Sandstone Beds|Identifying features|Sandy sequence forming the basal part of the Burra Group in the Willouran Range.|16-MAY-23
25696|Top Mount Sandstone Beds|Age reasons|Probably earliest Torrensian in age; may be equivalent to part of River Wakefield Subgroup or Rhynie Sandstone.|16-MAY-23
25696|Top Mount Sandstone Beds|Correlations|May be equivalent to part of River Wakefield Subgroup or Rhynie Sandstone.|16-MAY-23
25696|Top Mount Sandstone Beds|References|Murrell, B. 1977|16-MAY-23
19277|Wallatinna Formation|Name source|From Wallatinna Water Hole, Everard 1:250 000 map sheet, 10 km south of the Mount Johns Range. Grid reference 6605 5895.|16-MAY-23
19277|Wallatinna Formation|Unit history|"Davies Bores Conglomerate", Pitt et al. (1980) and Mount Johns Conglomerate, Krieg (1973).|16-MAY-23
19277|Wallatinna Formation|Type section locality|Located on the northern margin of the Mount Johns Range. Grid reference sections 1 a, b 3464993-34639989; 1 c 34599985-34599981; 2 a 34459980-34459979; 2 b 34399979-34399973.|16-MAY-23
19277|Wallatinna Formation|Extent|Exposed around the north and east margin of the Mount Johns Range, Wallatinna Water Hole area on NE Everard 1:250 000 map sheet.|16-MAY-23
19277|Wallatinna Formation|Thickness range|107-300 m. Type section 296 m.|16-MAY-23
19277|Wallatinna Formation|Lithology|Thin to very thin and flat bedded, coarse to granule arkose and interbedded red-brown to green siltstone, claystone, calcareous arkose and conglomerate. Pebbles rounded of pink, brown grey green claystone-siltstone, cobbles to boulders, white-pink granitoids, rare chert pebbles.|16-MAY-23
19277|Wallatinna Formation|Relationships and boundaries|Sharply overlies the Adelaidean Rodda Beds. Locally apparently conformable, but regionally considered to be unconformable. Intertongues with Observatory Hill Beds.|16-MAY-23
19277|Wallatinna Formation|Age reasons|No direct evidence. Suggested age Early Cambrian since it intertongues with the Observatory Hill Beds.|16-MAY-23
24559|War Loan Beds|Name source|War Loan Mine situated on the eastern margin of the Peake and Denison Ranges, 8.5 km southeast of Nilpinna H.S.; Boorthanna 1:100 000 sheet area, Warrina 1:250 000 sheet area; metric reference 6844733, 597225.|16-MAY-23
24559|War Loan Beds|Type section locality|600 metres of sediments outcropping in a synclinal structure adjacent to War Loan Mine; metric reference - base 6844675, 597225 - top 6844210, 597233.|16-MAY-23
24559|War Loan Beds|Extent|Outcrops in a synclinal structure adjacent to War Loan Mine.|16-MAY-23
24559|War Loan Beds|Thickness range|Maximum true thickness uncertain; the thickest development of sediments, 600 metres, is in the type section.|16-MAY-23
24559|War Loan Beds|Lithology|Blue-grey shale and siltstone; dark grey silty dolomite, greenish feldspathic sandstone and arkose.|16-MAY-23
24559|War Loan Beds|Relationships and boundaries|Faulted against the Cadlareena Volcanics in its type section. Probably grades upwards into the Nilpinna Beds (Ambrose and Flint, in prep.) although all contacts are tectonic.|16-MAY-23
24559|War Loan Beds|Age reasons|Lower Adelaidean (Willouran or Torrensian). The unit is believed to grade upwards into the Nilpinna Beds (Ambrose and Flint, in prep.) - lithological affinities and spatial relationships between outcrops of these un;its support this view. The lower contact is uncertain but probably occurs somewhere above the Rockwater Beds (Ambrose and Flint, in prep.).|16-MAY-23
24559|War Loan Beds|Proposed publication|Rept. Invest., Geological Survey SA.|16-MAY-23
24559|War Loan Beds|Defn Reference|81/21524|16-MAY-23
24559|War Loan Beds|Proposer|Ambrose G.J., Coats R.P.|16-MAY-23
24559|War Loan Beds|Resdate|29-OCT-1979|16-MAY-23
24561|Wardang Volcanics|Name source|Wardang Island: GR 137o22' : 34o30". Maitland 1:250 000 sheet area.|16-MAY-23
24561|Wardang Volcanics|Type section locality|Thickness is unknown. Best exposure on west coast of Wardang Island.|16-MAY-23
24561|Wardang Volcanics|Extent|The unit is exposed around the north, west and south coast of Wardang Island and adjacent islands. Also along the mainland coast at Pt Victoria and Point Pearce.|16-MAY-23
24561|Wardang Volcanics|Thickness range|Unknown, but minimum estimated as 10 m.|16-MAY-23
24561|Wardang Volcanics|Lithology|Porphyritic rhyo-dacite, with minor latite; minor "conglomerates" and metasediments; metamorphic and tectonic events have modified the rocks, destroying primary textures.|16-MAY-23
24561|Wardang Volcanics|Relationships and boundaries|Base not seen. Unconformably overlain by Permian glacigene sediments on southeast, Pliocene Hallet Cove Sandstone on south and southwest and Quaternary on west and north sides of Wardang Island (Bone, 1978).|16-MAY-23
24561|Wardang Volcanics|Age reasons|Rb/Sr figure of 1735 m.y., but this may be a re-setting event.|16-MAY-23
24561|Wardang Volcanics|Proposed publication|Quarterly Geological Notes, Geological Survey SA, No. 89: 2-7,|16-MAY-23
24561|Wardang Volcanics|Comments|Described P2|16-MAY-23
24561|Wardang Volcanics|Proposer|Bone, Y|16-MAY-23
24561|Wardang Volcanics|Resdate|04-NOV-1983|16-MAY-23
24579|Wirrawilka Beds|Name source|After the Wirrawilka copper workings, approximately 8 km NNE of Mount Craig.  Map symbol: Pcw.|16-MAY-23
24579|Wirrawilka Beds|Unit history|Referred to informally as Unit A by Preiss (1978).|16-MAY-23
24579|Wirrawilka Beds|Type section locality|A structurally uncomplicated section is chosen 1.5 km south of Niggly Gap, where the upper carbonates are well exposed in a deeply incised small stream. The section commences at 277230-6466700 and finishes at 277340-6466740.|16-MAY-23
24579|Wirrawilka Beds|Extent|Extend with minor structural interruptions, for a strike length of about 8 km, along the axial region of the Worumba Anticline.|16-MAY-23
24579|Wirrawilka Beds|Thickness range|150 m at the type section, but thicker to the north, and may include dolomitic interbeds stratigraphically below those of the type section.|16-MAY-23
24579|Wirrawilka Beds|Lithology|Lithological Sequence at the type section.  Top:  10 m limestone, dolomitic, pale grey to buff, with laterally linked stromatolites and siliceous laminations.  12 m limestone, dolomitic, buff, wavy laminated, with possible laminar fenestral fabric.  10 m limestone, dolomitic, cryptalgal laminated, with quartz pseudomorphs possibly after gypsum; bands ferroan dolomicrite, locally with fresh pyrite. 20 m limestone, pale grey, with laterally linked and pseudocolumnar stromatolites.  52 m siltstone, drk grey to greenish grey, laminated with fine sandy laminations up to 1 cm thick, partly graded.  2 m limestone, red, ferruginous, recrystallised, partly laminated.  32 m siltstone, dark grey to greenish grey, with fine sandy bands  Base:  12 m dolomite, pale brown, partly brecciated and veined.|16-MAY-23
24579|Wirrawilka Beds|Relationships and boundaries|Lower boundary everywhere either tectonic, or intrusive contact with carbonate breccia. Precise relationships of lower part of sequence in northern outcrops to type section not known. Upper boundary conformable in type section, but tectonic or intrusive north of Willow Creek.|16-MAY-23
24579|Wirrawilka Beds|Identifying features|Definition: The oldest sedimentary sequence recognised in the core complex of the Worumba Anticline, and consisting of laminated siltstone with interbedded dolomitic limestone, and an extensive mappable marker at the top (a stromatolitic dolomitic limestone).|16-MAY-23
24579|Wirrawilka Beds|Structure and Metamorphism|Form part of the steeply dipping, east facing limb of the Worumba Anticline within the core complex, immediately adjacent to its axial trace. Along strike, the Beds are cut by cross-faults and related drag folds, and are locally intruded by carbonate breccia. North of Willow Creek they form an isoclinal anticline with steeply plunging northern and southern closures. Elsewhere, eg. in the Wirrawilka mines area, the Beds orrur only as disrupted blocks, in places themselves segments of macroscopic folds, completely encased in carbonate breccia.|16-MAY-23
24579|Wirrawilka Beds|Age reasons|Age inferred to be Willouran.|16-MAY-23
24579|Wirrawilka Beds|Correlations|No certain correlative known outside the Worumba Anticline.|16-MAY-23
24579|Wirrawilka Beds|Proposed publication|Quarterly Geological Notes, Geological Survey SA, 76:12-23, 10/7/79|16-MAY-23
24579|Wirrawilka Beds|Defn Reference|82/22702|16-MAY-23
24579|Wirrawilka Beds|Proposer|Preiss W.V.|16-MAY-23
24579|Wirrawilka Beds|Resdate|03-JUL-1979|16-MAY-23
24580|Wirreanda Dolomite Beds|Name source|Warreanda Creek, 20 km south of the type area, near which are exposed probable equivalents of the Wirreanda Dolomite Beds.  Map symbol Prw.|16-MAY-23
24580|Wirreanda Dolomite Beds|Unit history|Referred to informally as Unit L by Preiss (1978).|16-MAY-23
24580|Wirreanda Dolomite Beds|Type section locality|A reasonably well-exposed section, commencing along Willow Creek at 277900-6467450 but then diverging from it towards Mount Plantagenet and finishing at 279580-6468740.|16-MAY-23
24580|Wirreanda Dolomite Beds|Description at type locality|Top: 50m dolomite, pale grey, weathering blue-grey, flaggy, well laminated and partly silty, platy; poor outcrop. 58m dolomite, pale grey, weathering cream, wavy bedded, intraclastic bands with tepee structures; interbeds platy dolomitic siltstone. 68m dolomite, dark blue-grey, platy, sandy lamination 2-5mm thick. 26m dolomite, blue-grey, platy, interbedded magnesite conglomerate. 43m dolomite, medium to pale grey, weathering brown, recrystallised; tepee structures and interbedded platy dolomitic siltstone. 4m dolomite, blue-grey, interbeds magnesite conglomerate. 41m dolomite, blue-grey, platy, tepee structures; partly flaggy, silty. 87m dolomite, medium grey, flaggy, well laminated, partly wavy. 52m dolomite, weathering pale grey to cream, tepee structures. 99m dolomite, weathering pale greenish grey, silty to fine sandy, flaggy. 4m siltstone, weathered pale grey, dolomitic, platy. 117m dolomite, blue-grey, flaggy to platy, laminated, thin gritty bands and lenses, 1-10cm thick, including black chert grains; large-scale ripple marks in coarse dolomitic sandstone; tepee structures and mudcracks. 68m dolomite, blue-grey, weathering pale grey to reddish, platy, in part silicified. 116m dolomite, pale grey to blue-grey, weathering cream, laminated, tepee structures, intraformational conglomerate bands and gritty laminae. 10m sandstone, pale grey, weathering brown, massive, medium to coarse grained, dolomitic, dolomite intraclasts; interbeds laminated grey dolomite near base. 40m dolomite, weathering cream, flaggy, laminated. 33m sandstone, pale grey, weathering brown, dolomitic, coarse grained; interbeds grey dolomite, weathering cream. 40m dolomite, minor interbeds dolomitic sandstone. 27m sandstone, pale grey, weathering brown, dolomitic, massive, medium to coarse grained; coarse bedding laminations outlined by grain size variations. 57m dolomite, dark grey, flaggy, partly laminated, tepee structures; several 50cm interbeds dolomitic sandstone with symmetrical ripple marks. 12m orthoquartzite, pale grey, massive, medium grained, scattered coarse rounded quartz grains. 8m dolomite, pale grey, sandy, flaggy. 6m orthoquartzite, pale grey, massive, medium grained with scattered rounded coarse quartz grains. 10m dolomite, pale grey, flaggy, sandy. 4m quartzite, pale grey, weathering brown, dolomitic, medium grained. 4m siltstone, green-grey to khaki, flaggy, dolomitic, silicified. 6m sandstone, pale grey, dolomitic, platy, medium and coarse-grained bands, shaly partings. Grades down to- 46m siltstone, pale grey, dolomitiac, platy; thin interbeds dolomite, pale grey, flaggy, with wavy bedding and tepee structures; lower part dark grey, platy, micaceous siltstone, with thin sandy and shaly bands and even and flaser lamination. (see Comments for further section)|16-MAY-23
24580|Wirreanda Dolomite Beds|Extent|The Beds occur over a continuous strike length of 11 km in the eastern part of the core complex of the Worumba Anticline, and in several isolated blocks in carbonate breccia to the north and south.|16-MAY-23
24580|Wirreanda Dolomite Beds|Thickness range|About 1300 m exposed in the type section.|16-MAY-23
24580|Wirreanda Dolomite Beds|Relationships and boundaries|Nowhere seen in conformable sedimentary contact with other sequences. Type section bounded to west by intrusive carbonate breccia, elsewhere in fault contact with Niggly Gap Beds. Eastern boundary either with intrusive carbonate breccia, or (as in the case of the type section) disconformity with overlying Sturtian formations (Holowilena Ironstone, and elsewhere, Wilyerpa Formation). In places there is strong angular unconformity beneath the Wilyerpa Formation, e.g. 3 km SSW of 'Worumba' H.S.|16-MAY-23
24580|Wirreanda Dolomite Beds|Identifying features|Definition: A sequence of thinly bedded dark grey dolomite, weathering blue-grey to brown, with minor interbedded siltstone, dolomitic sandstone, magnesite conglomerate and black chert, occurring in the eastern part of the Worumba Anticline core complex. The general facies resembles that of known Burra Group carbonates.|16-MAY-23
24580|Wirreanda Dolomite Beds|Structure and Metamorphism|Beds mostly steeply east dipping, though at northern extremity, tend to be overturned. In the type section, the outcrop width is increased by open folding, with upright axial planes and gently plunging, mainly meridional axes.|16-MAY-23
24580|Wirreanda Dolomite Beds|Age reasons|The Wirreanda Dolomite Beds closely resemble known Burra Group carbonates, in particular the Skillogalee Dolomite and the Blyth Dolomite. They are distinguished in the Worumba area from the Skillogalee Dolomite by the absence of columnar stromatolites, a lower magnesite content, and the abundance of tepee structures. As outcrops of the two units are in places only a kilometre apart, stratigraphic equivalence would require lateral facies changes more rapid than is characteristic of the Skillogalee Dolomite elsewhere. In the vicinity of the Wirreanda Creek (Yednalue 1:50 000 sheet area) probable equivalents of the Wirreanda Dolomite Beds have been mapped as part of the River Wakefield Subgroup, overlain conformably by siltstones of the River Wakefield Subgroup, followed by Yednalue Quartzite (Binks, 1968). Such a stratigraphic position is tentatively accepted, and the Wirreanda Dolomite Beds are included in the River Wakefield Subgroup of the Burra Group. Nevertheless, a relatively abrupt facies change (within about 20 km) is required between the Worumba and Yednalue Anticlines; in the latter, the carbonates of the River Wakefield Subgroup contain stromatolites and abundant magnesite conglomerate, and are difficult to distinguish lithologically from the Skillogalee Dolomite.  The age is inferred to be early Torrensian.|16-MAY-23
24580|Wirreanda Dolomite Beds|Proposed publication|Quarterly geological Notes, Geological Survey SA, 76:12-23|16-MAY-23
24580|Wirreanda Dolomite Beds|Comments|(Continued from description at type locality)  25m orthoquartzite, medium grey, fine grained, massive, laminated, with mound shapes possibly due to algal trapping of sand grains. 85m dolomite, medium grey, weathering pale brown, platy to flaggy, silty; interbeds dolomite, dark blue-grey finely laminated, blebs and lenses of black chert. 4m sandstone, pale grey, weathering brown, dolomitic, medium to coarse grained, interbeds blue-grey dolomite. 2m magnesite conglomerate, fine grained, interbedded with sandy dolomite. 10m siltstone, blue-grey, platy, dolomitic, thin interbeds pale grey, brown weathering dolomite and silicified magnesite conglomerate. Base: 58m dolomite, flaggy to blocky, pale grey, weathering brown, medium sandy; interbedded with flaggy pale grey dolomite; some styolitic laminations.|16-MAY-23
24580|Wirreanda Dolomite Beds|Proposer|Preiss W.V.|16-MAY-23
24580|Wirreanda Dolomite Beds|Reserved? Yes/No|Yes|16-MAY-23
20498|Woodendinna Dolomite|Name source|Woodendinna Bore approximately 10 km due east of Point Well H.S. and 2 km west of the Type Section.|16-MAY-23
20498|Woodendinna Dolomite|Type section locality|Located in the Wirrapowie Creek at the boundary of the Blinman and Cadnia 1:63 360 sheets. Latitude 31o00', longitude 139o00'. Easiest access by 4-WD, 15 km from a point midway between Point Well and Narrina on the road to Pinda Spring.|16-MAY-23
20498|Woodendinna Dolomite|Extent|The unit is exposed in most basal-Cambrian sections of the Flinders Ranges, SA. Greatest thicknesses are attained in the NE, whilst in the Central Flinders the unit may be greatly reduced or absent.|16-MAY-23
20498|Woodendinna Dolomite|Thickness range|176 m in the type Section. Variable elsewhere.|16-MAY-23
20498|Woodendinna Dolomite|Lithology|Flaggy to massive yellow-weathering dolomites with abundant interbedded stromatolites, dolomite intraclast conglomerataes, ooid grainstones and thin quartz sandstones. Desiccation mud-cracks are very common. Base is taken at the abarupt first appearance of carbonates above the impure sands of the Parachilna Formation. Top is the last dolomite bed beneath the basal Wirrapowie Limestone. Algal stromatolites and very minor bioturbation are the only evidence of a biota.|16-MAY-23
20498|Woodendinna Dolomite|Age reasons|Lower Cambrian. Overlies Diplocraterion beds of Parachilna Formation. Stratigraphically well below Faunal Assemblage 2 of Daily (1956).|16-MAY-23
20498|Woodendinna Dolomite|Proposed publication|Trans. R. Soc. South Australia, 99(4), 211-219, 30/11/1975|16-MAY-23
20498|Woodendinna Dolomite|Comments|Additional notes: This unit has been mapped on published map sheets (Copley & Parachilna 1:25 000 sheets) as Wilkawillina Limestone, although it is lithologically distinct from this unit viz Wilkawillina L/S. Lithological equivalents of the Woodendinna Dolomite occur within the basal Ajax L/S and Andamooka L/S to the west of the Flinders Ranges.|16-MAY-23
20498|Woodendinna Dolomite|Name first published by|Thomson B.P., Daily B., Coats R.P., Forbes B.G., 1976|16-MAY-23
24585|Worumba Dolomite Beds|Name source|Worumba' station, which includes the bulk of the outcrop area of the Worumba Anticline core complex.  Map symbols: Pcm1, Pcm2, and Pcm3.|16-MAY-23
24585|Worumba Dolomite Beds|Unit history|Referred to informally as Units H, I and J by Preiss (1978).|16-MAY-23
24585|Worumba Dolomite Beds|Type section locality|A well-exposed, realtively uncomplicataed and continuous section along Willow Creek is selected to represent the Worumba Dolomite Beds, commencing at 276240-6468270 and finishing at 275800-6468400.|16-MAY-23
24585|Worumba Dolomite Beds|Extent|The Beds occur in three separate blocks within the Worumba Anticline core complex, but not yet recorded from elsewhere.|16-MAY-23
24585|Worumba Dolomite Beds|Thickness range|Total thickness preserved in type section is 416 m.|16-MAY-23
24585|Worumba Dolomite Beds|Lithology|Lithological Sequence in the Type Section.  Three informal members have been mapped:  Top: Pcm3 (massive dolomite). 8m dolomite, coarsely recrystallised.  32 m dolomite, pale cream, weathering brown, laminated, with stromatolitic domes, tepee ridges and disharmonic synsedimentary folds.  28 m dolomite, white weathered, recrystallised, wavy laminated paratly leached, locally fractured.  96 m dolomite, pale grey, weathering brown, massive, flaggy interbeds, 2-5 mm thick cryptalgal laminations, partly slumped; recrystallised intraclasts; small stromatolitic domes and tepee structures. Minor silty laminated dolomite.  Pcm2 (siltstone).  28 m siltstone, dark grey with greenish and reddish weathered laminations, very thinly laminated, coarse grained, slightly calcareous.  96 m siltstone, dark blue-grey, platy, partly silicified, minor interbeds dolomite.  Pcm1 (dolomite with siltstone interbeds).  34 m dolomite, cream to pale brown, evenly laminated, possible tepee structures.  12 m siltstone, platy, silicified, weathering reddish.  4 m dolomite, pale grey, blocky, evenly laminated.  22 m siltstone, silicified, weathering reddish, alternating with dolomite, laminated, in 1-3 m thick bands; cut and fill structures, pseudocolumnar stromatolites.  Base: 56 m dolomite, weathering, pale buff and pale grey laminated, partly wavy, tepee structures, siliceous blebs.|16-MAY-23
24585|Worumba Dolomite Beds|Relationships and boundaries|In the type section, bounded above and below by intrusive carbonate breccias. However, block of probable Worumba Dolomite Beds around Morgan Creek overlies upper siltstone member of Waraco Limestone in cores of small anticlines and along strike from type Waraco Limestone. Although there is much faulting in this area, contact appears sedimentary and conformable. Worumba Dolomite Beds thus inferred to overlie conformably the Waraco Limestone. No sedimentary contact with any overlying units is exposed in the Worumba Anticline.|16-MAY-23
24585|Worumba Dolomite Beds|Identifying features|Definition: Dolomite with interbedded carbonaceous siltstone intervals, interpreted as the youngest Willouran unit exposed in the area.|16-MAY-23
24585|Worumba Dolomite Beds|Structure and Metamorphism|Worumba Dolomite Beds occur as blocks almost completely circumscribed by intrusive carbonate breccia. Only in the vicinity of Morgan Creek do they maintain structural integrity with the underlying sequence.|16-MAY-23
24585|Worumba Dolomite Beds|Age reasons|No certain correlatives of the Worumba Dolomite Beds known from outside the Worumba Anticline, although comparable massive dolomites known in many diapirs. Age inferred to be Willouran.|16-MAY-23
24585|Worumba Dolomite Beds|Proposed publication|Quarterly Geological Notes, Geological Survey SA, 76:12-23|16-MAY-23
24585|Worumba Dolomite Beds|Proposer|Preiss W.V.|16-MAY-23
24585|Worumba Dolomite Beds|Resdate|03-JUL-1979|16-MAY-23
24591|Yadlamalka Formation|Name source|"Yadlamalka" Station, latitude 32o01'58"S, longitude 137o53'27"E, Port Augusta 1:250 000 sheet area (SI 53-4).|16-MAY-23
24591|Yadlamalka Formation|Unit history|Previously referred to as upper unnamed member of the Skillogalee Dolomite (Coats et al. 1969).|16-MAY-23
24591|Yadlamalka Formation|Type section locality|Located in Depot Creek from latitude 32o13'30"S, longitude 137o57'13"E (base) to latitude 32o13'30"S, longitude 137o57'35"E (top of section), and consists of 258 m of dolomites, sandstones and magnesites. The base is marked by dark grey dolomites above an 8 m thick quartzite at top of the Nathaltee Formation, and the transitional upper boundary occurs at the introduction of the sandstone dominated sequence of the Undalya Quartzite (Wilson 1952).|16-MAY-23
24591|Yadlamalka Formation|Extent|This formation occurs in most Burra Group (Thomson et al. 1964) outcrops in the northern Mt Lofty and Flinders Ranges, on the following 1:250 000 sheet areas - Burra (SI 54-5), Orroroo (SI 54-1), Port Augusta (SI 53-4), Parachilna (SH 54-13), Copley (SH 54-9), Andamooka (SH 53-12), Curdimurka (SH 53-8), Marree (SH 54-5).|16-MAY-23
24591|Yadlamalka Formation|Thickness range|220-3000 m.|16-MAY-23
24591|Yadlamalka Formation|Lithology|Dark grey laminated dolomicrites with occasional dessication cracks and black nodular chert; dark grey domal and columnar stromatolitic dolomite with black nodular chert; intraformational magnesite conglomerates; and grey dolomitic sandstones. Minor laminated micritic magnesite, intraformational dolomite conglomerates, oolitic dolomite, oncolitic dolomite and siltstone.|16-MAY-23
24591|Yadlamalka Formation|Relationships and boundaries|Underlain conformably by the Nathaltee Formation (new name to be proposed in same publication), Yednalue Quartzite (Spry, 1952) or Bungaree Quartzite (Forbes, 1977) in the northern Mt Lofty and Southern Flinders Ranges, and by the Nankabunyana Formation (new name to be proposed in same publication) in the Northern Flinders Ranges. Overlain conformably by the Undalya Quartzite in northern Mt Lofty and Southern Flinders Ranges, and by the Myrtle Springs Formation (Coats, 1973) in the northern Flinders Ranges.|16-MAY-23
24591|Yadlamalka Formation|Age reasons|Position within the Burra Group which is considered as Torrensian (Thomson et al. 1964) indicates a Torrensian age.|16-MAY-23
24591|Yadlamalka Formation|Proposed publication|Transactions of the Royal Society of South Australia|16-MAY-23
24591|Yadlamalka Formation|References|79/20014; 01/31621|16-MAY-23
24591|Yadlamalka Formation|Resdate|17-FEB-1978|16-MAY-23
26241|Yantea Rhyodacite|Name source|From Yantea Well on Moonarie station, which adjoins Lake Everard station on the Gairdner 1:250 000 Sheet area. Yantea well is locataed at 31o50' latitude and 135o30.25' longitude. Origin: A strongly welded crystal-vitric ashflow tuff. A composite sheet consisting of at least three simple cooling units. Welding is not so strong in the zones between the simple cooling units.|16-MAY-23
26241|Yantea Rhyodacite|Type section locality|Is not possible to define a type section including the base and top of this unit, but the type example of this unit occurs on Everard Hill (formerly Black Hill) which is located at latitude 31o40' and longitude 135o08'.|16-MAY-23
26241|Yantea Rhyodacite|Extent|The most extensive unit in the Glyde Hill Complex (Blissett), occupying a large area in the central west of the Gairdner 1:250 000 sheet area and extending onto the central eastern portion of the Childara 1:250 000 sheet area.|16-MAY-23
26241|Yantea Rhyodacite|Lithology|A distinctive brick red coloured rock both in hand specimen and weathered outcrop. Medium to coarse grained plagioclase and alkali feldspar phenocrysts and green patches of chlorite replacing ferromagnesian minerals are scattered through a microcrystalline groundmass. This unit is composite and is made up of at least three and possibly more, simple cooling units. These simple cooling units are almost identical in hand specimen and therefore it is not practicable to separate them into individual mappable units. The simple cooling units are separated from each other by narrow zones (usually <4 m thick) of fine grained crystal tuff which are poorly welded and in which devitrification has not obscured the outlines of the relatively undeformed shards. Commonly these zones are highly vesicular with vapour phase chlorite, epidote and quartz filling the vesicles. Zones of flow brecciation at the base of the simple cooling units are also often seen. In thin section the Yantea Rhyodacite consists of euhedral phenocrysts of simply twinned alkali feldspar, plus altered plagioclase as isolated crystals and glomeroporphyritic aggregates sitting in a completely devitrified groundmass. The groundmass shows variable devitrification textures ranging from granophyric to patch to microgranular. Always the groundmass devitrification textures are relatively coarse, suggesting slow cooling within the thick ashflow sheets. Limonite is scattered throughout the groundmass, imparting the characteristic red colouration of the rock. Medium to coarse plagioclase phenocrysts are dominant. Fresh clinopyroxene is rarely seen, most being altered to green chlorite, which still retains the euhedral outlines of the original clinopyroxene. Phenocrysts make up a total of about 15-20% of the rock.|16-MAY-23
26241|Yantea Rhyodacite|Relationships and boundaries|This unit is overlain by the Whyeela Dacite and a minor unnamed rhyolite in the south. The Yantea Rhyodacite in turn disconformably overlies a number of older units. A significant period of erosion must have preceded the outpouring of the Yantea Rhyodacite as this unit is seen to overlie the Bunburn Dacite, Arburee Rhyolite, Wheepool Rhyolite, Waurea Pyroclastics, Baldry Rhyolite and Mordinyabee Rhyodacite at various places in the mapped area. Further evidence comes from the occurrence of tongues of Yantea Rhyodacite sitting in troughs or erosional lows within the Arburee Rhyolite and Wheepool Rhyolite. At this same stratigraphic level, the only outcrops of volcaniclastics in the Glyde Hill complex were noted - indicative of erosion. Thickness variable, but would reach at least 150 m in places.|16-MAY-23
26241|Yantea Rhyodacite|Age reasons|Forms part of the Glyde Hill Complex as defined by Blissett. Age is mid-Carpentarian or roughly 1550 Ma upon geochronological evidence.|16-MAY-23
26241|Yantea Rhyodacite|Defn author|Giles C.W., 1977|16-MAY-23
26241|Yantea Rhyodacite|References|79/00495|16-MAY-23
