Stratigraphic Name | Stratno |  Previous Name  |Previous Name Stratno| Replacement Name | Replacement Name Stratno |Is Current | Rank | Status | Category | Usage | Parent Name | Parent Stratno | Chemical Parent Name | Chemical Parent Stratno | Top Minimum Age Name | Top Minimum Age (Ma) | Top Minimum Age Error (Ma)| Top Minimum Age Method | Topstrat Age Event | Base Maximum Age Name | Base Maximum Age (Ma) | Base Maximum Age Error (Ma) | Base Maximum Age Method | Basestrat Age Event | Minimum Thickness (m) | Maximum Thickness (m) | Type Section State | Definition Card | First ref as on form | Def ref as on form | Reserved by | Resdate | Approved by | Approved date |General Comments | Lithology Description | Primary Lithology Group | Secondary Lithology Group | Tectonic Setting | Intrusive | Granite Type | Last Update
Acton Shale|90|Acton Shale Member|88|||Yes|Formation, beds|Formal|Other new published name|Defined|Bendoc Group|1474|||Upper Ordovician||||deposition|Upper Ordovician||||deposition|||ACT|No|43385|44970|||||Defined 1958. Reduced to Member of the Pittman Formation for many years, but younger graptolite fossils recognised. Listed as a member of the Pittman Formation in GSNSW seamless geology 2021, although proposed to be included in  the Warbisco Shale of the Bendoc Group in 2018.||siliciclastic sedimentary rock|||N||17-JAN-23
Barracks Creek Monzogranite|76942|Barracks Creek Adamellite|1154|||Yes|Formation, beds|Informal|Variation of published name|Briefly described|||||Lower Devonian||||intrusion|Late Silurian||||||||No|||Blevin, P. (GSNSW)|14-JUN-12|||Name updated to meet IUGS standards. Published in GSNSW seamless geology.|Monzogranite, leucogranite|acid intrusive rock|||Y|I-type|29-SEP-23
Bendora Granodiorite|25781|Bendora Granite|1475|||Yes|Formation, beds|Formal|Variation of published name|Defined|||McKeahnie Suite|31610|Late Silurian||||intrusion|Late Silurian|||||||ACT|No|36441|45147|||||See also Bendora Granite. This name included in GSNSW 2013 list of current names.|Granodiorite|acid intrusive rock|||Y|S-type|17-JAN-23
Black Bog Shale|1776|||||Yes|Formation, beds|Formal|Variation of published name|Defined|Hattons Corner Group|8145|||Ludlow|||biozone|deposition|Ludlow|||||67|152|NSW|No|43385|68592|||||Originally named Black Bog Shales (Brown, 1940). Formerly of the Booroo Ponds Group, now (2012) included in the Hattons Corner Group. Geological Province: Canberra-Yass Shelf.|Dark grey shale, mudstone, siltstone and black graptolitic shale; and 2 unnamed subunits of black graptolitic shale/mudstone/silstone(upper) and dark grey shale/mudstone (lower)|fine grained siliciclastic rock|||N||06-SEP-23
Black Mountain Sandstone|24186|||||Yes|Formation, beds|Formal|Variation of published name|Defined|||||Early Silurian|||inferred, overlying unit|deposition|Early Silurian|||inferred, underlying unit|||450|ACT|Yes|39800|42820|Abell, R.S. (after Opik 1958)|26-OCT-90|Brakel, A.|26-OCT-90|Defined in BMR Bulletin 233 (1991). Reassigned Silurian in age from Ordovician in Bega-Mallacoota 1:250000 Geological Sheet SJ/55-4, SJ/55-8: Explanatory Notes (1994). Extended to include Tidbinbilla Quartzite on Abell et al 2008 - Geology of the ACT.|Grey, thickly bedded, massive, medium-grained arenite with siltstone and shale interbeds.|siliciclastic sedimentary rock|||N||17-JAN-23
Booroomba Leucogranite|2286|||||Yes|Formation, beds|Formal|Unknown or process pending|Defined|||||Pridoli||||intrusion|Ludlow|||||||ACT|No|32820|45147||||||Leucogranite, aplite|acid intrusive rock|||Y|S-type|17-JAN-23
Bullanamang Porphyry|2885|||||Yes|Formation, beds|Formal|Resvd name published|Defined|Bredbo Group|21321|||Lower Devonian||||eruption|Late Silurian||||||500|NSW|Yes|32820|36413|Richardson S.J.||Hawke, J.|20-FEB-79|Parent stated as Colinton Volcanics in Bega-Mallacoota Explan Notes.|Porphyry, coarse grained intrusive rhyolite porphyry|acid intrusive rock|||Y||17-JAN-23
Bullenbalong Suite|2895|||||Yes|Group, Suite|Formal|Variation of published name|Fully described|||Bullenbalong Supersuite|2897|Wenlock||||intrusion|Wenlock||||||||No|41563|||||||Rocks crowded with biotite and cordierite-rich enclaves.  The Bullenbalong pluton is of grey cordierite granites with the assemblage quartz, plagioclase, K-feldspar, red-brown biotite and cordierite with accessory apatite, zircon and monazite.|acid intrusive rock|||Y|S-type|17-JAN-23
Camp Hill Sandstone Member|24208|Camp Hill Sandstone|3407|||Yes|Member, phase|Formal|Variation of published name|Redefined|Canberra Formation|3447|||Wenlock|||inferred, biostratigraphic correlation|deposition|Wenlock||||||100|ACT|Yes|36633|42820|Abell, R.S. (after Opik 1958)|26-OCT-90|Brakel, A.|26-OCT-90|Defined in BMR Bulletin 233. RefID 22857  increases to c.100m the definition thickness of 60m.|Well-bedded arenite and siltstone; thin shale partings; thin beds of coarse-grained quartz arenite at the base.|siliciclastic sedimentary rock|||N||17-JAN-23
Canberra Formation|3447|Canberra Group|3450|||Yes|Formation, beds|Formal|Variation of published name|Defined|||||Wenlock|432.3|3.1|inferred, overlying unit|deposition|Wenlock|||inferred|deposition||1000|ACT|Yes|36633|42820|Abell, R.S. (after Henderson, G.A.M., after Opik 1958)|29-OCT-90|Brakel, A.|26-OCT-90|BMR Bulletin 233. Draft definition card by Henderson 1978, approved definition by Abell 1990. Canberra & Michelago 1:100k sheet areas. Equivalent to, but not yet formally included in, the Douro Group [2012]. Minimum age from Laidlaw Volcanics (GS NSW seamless geology 2021).|Mudstone, siltstone, minor sandstone, limestone, hornfels, dacitic ignimbrite volcaniclastic sediments, minor agglomerate and ashstone.|siliciclastic sedimentary rock|acid volcanic rock||N||17-JAN-23
Cappanana Formation|3554|Cappanana beds|24819|||Yes|Formation, beds|Formal|Variation of published name|Defined|Bredbo Group|21321|||Ludlow||||deposition|Late Silurian||||||700|NSW|No|32820|42820|||||Also Defined in Bega-Mallacoota 1:250000 Geological Sheet SJ/55-4, SJ/55-8: Explanatory Notes (1994). Equivalent to, but not yet formally included in, the Douro Group.|Siltstone, shale, sandstone, limestone and minor volcanics, tuff, quartzite, minor limestone, calc-silicate hornfels.|siliciclastic sedimentary rock|carbonate sedimentary rock||N||17-JAN-23
Captains Flat Formation|3563|Captains Flat Beds|3562|||Yes|Formation, beds|Formal|Variation of published name|Defined|Hoskinstown Group|8512|||Late Silurian|419.6|2.7|isotopic, U/Pb-Pb/Pb ion probe|magmatic crystallisation|Late Silurian|428.1|2.9|isotopic, U/Pb-Pb/Pb ion probe|||1200|NSW|Yes|12185|42820||||||Shale, siltstone, acid and basic volcanic flows and tuff; minor basalt and basaltic breccia, dacite and rhyodacite, lithic tuff and minor shale and conglomerate, volcanic chert.|fine grained siliciclastic rock|igneous volcanic rock||N||17-JAN-23
Carwoola Formation|3716|Carwoola Beds|3715|||Yes|Formation, beds|Formal|Variation of published name|Defined|Hoskinstown Group|8512|||Late Silurian||||deposition|Late Silurian||||||1200|NSW|Yes|32820|42820|Abell, R.S. (after Richardson, 1979)|02-APR-07||||Sandstone, siltstone, shale|siliciclastic sedimentary rock|||N||17-JAN-23
Cavan Bluff Limestone|3824|Cavan Formation|3826|||Yes|Formation, beds|Formal|Variation of published name|Fully described|Murrumbidgee Group|27854|||Pragian||||deposition|Pragian||||||||No|12185||||||Same unit as variations - Cavan Limestone and Cavan Formation.|Blue-grey, massive, thin to medium bedded, flaggy, impure, silty limestone interbedded with shale overlain by medium-thick bedded highly fossiliferous limestone.|carbonate sedimentary rock|fine grained siliciclastic rock||N||17-JAN-23
Clear Range Granodiorite|4128|||||Yes|Formation, beds|Formal|Other new published name|Defined|||Clear Range Suite|31567|Late Silurian||||intrusion|Late Silurian|||||||ACT|No|45003|36413|||||Type area on Clear Range (ACT/NSW border). Sample 20535 (Joyce, 1973a,b), from GR 814533 is said to be fairly representative. References imply that this location is in the ACT.|Xenolith-rich granodiorite, muscovite biotite granodiorite to tonalite|acid intrusive rock|||Y|S-type|17-JAN-23
Clear Range Suite|31567|||||Yes|Group, Suite|Formal|Variation of published name|Briefly described|||Bullenbalong Supersuite|2897|Lower Devonian|||||Silurian||||||||No|42726|||||||Granite, granodiorite and tonalite|acid intrusive rock|||Y||17-JAN-23
Cliftonwood Limestone Member|4165|Cliftonwood Limestone|4167|||Yes|Member, phase|Formal|Variation of published name|Defined|Yass Formation|20908|||Wenlock||||deposition|Wenlock||||||65|NSW|No|38035|68592|||||Interbedded with the O'Briens Creek Sandstone Member within the Yass Formation.|Well bedded, stromatolitic, calcareous mudstone; poorly fossiliferous limestone, micritic nodular limestone, intraclastic limestone, interbedded mudstone and fine-medium grained sandstone; algal biomicrite and intramicrudite with abundant fossils.|carbonate sedimentary rock|fine grained siliciclastic rock||N||17-JAN-23
Colinton Volcanics|4334|||||Yes|Formation, beds|Formal|Other new published name|Redefined|Bredbo Group|21321|||Late Silurian|||inferred, overlying unit|magmatic crystallisation|Late Silurian|425.1|3.2|isotopic, U/Pb-Pb/Pb ion probe|||4000|NSW|Yes|12185|42820|||||Also defined and thickness stated as 700m in Bega-Mallacoota Explan Notes. Ngunawal Basin. Includes part of  the former "Bransby Beds" of Richardson (1979). Unclear where stratigraphically the dated samples came from. Change in numerical age boundary for Silurian/Devonian Periods since 1995 has changed the age of this unit from late Silurian to Early Devonian; but after Ogg et al. (2008) its maximum is back in the Silurian! Equivalent to, but not yet formally included in, the Douro Group.|Rhyolitic to rhyodacitic crystal and lithic tuff, minor siltstone, sandstone, and limestone lenses; dacite, andesite, rhyolite, tuff, limestone|acid volcanic rock|||N||17-JAN-23
Copper Creek Shale|4677|Copper Creek Beds|4676|||Yes|Formation, beds|Formal|Variation of published name|Defined|Hoskinstown Group|8512|||Late Silurian|||inferred, biostratigraphic correlation|deposition|Late Silurian|||inferred, biostratigraphic correlation|||150|NSW|Yes|12185|42820||||||Dark grey shale and siltstone, arenite beds near base; minor limestone; contains corals.|siliciclastic sedimentary rock|||N||17-JAN-23
Cowridge Siltstone|4813|||||Yes|Formation, beds|Formal|Other new published name|Defined|Hattons Corner Group|8145|||Pridoli|||inferred, biostratigraphic correlation|deposition|Pridoli|||biozone||85|155|NSW|No|31852|68592|||||Formerly of the Barambogie Group, now included in the Hattons Corner Group.|Interbedded siltstone, fine-grained sandstone, mudstone. Also includes an upper and lower mudstone subunit.|siliciclastic sedimentary rock|||N||06-SEP-23
Deakin Volcanics|25874|||||Yes|Formation, beds|Formal|Unknown or process pending|Redefined|Douro Group|5668|Laidlaw Volcanic Suite|10023|Late Silurian|||inferred, overlying unit|eruption|Late Silurian||||||1500|ACT|Yes|43385|42820|Abell, R.S. (after Opik 1958)|26-OCT-90|Brakel, A.|26-OCT-90|BMR Bulletin 233. Similar composition and probably similar age (Early Devonian) to Colinton Volcanics. Includes acanthodian fish spines in sandstone. Canberra & Michelago 1:100k sheet areas. Equivalent to, but not yet formally included in, the Douro Group [2012].|Rhyodacitic ignimbrite and minor volcaniclastic and argillaceous sediments|acid volcanic rock|||N||17-JAN-23
Douro Group|5668|Douro Volcanics|5674|||Yes|Group, Suite|Formal|Variation of published name|Defined|||||Ludlow|||inferred, overlying unit||Wenlock|432||inferred, intrusive relationship||||NSW|No|30731|35070|||||Used on the new GOULBURN 1:250 000 sheet (2006) also. Includes Hawkins Volcanics, age: 433.7 Ma.|Felsic ignimbrites and volcaniclastics; terrestrial and marine deposits.|siliciclastic sedimentary rock|||N||17-JAN-23
Federal Golf Course Tonalite|24274|||||Yes|Formation, beds|Formal|Resvd name published|Defined|||Federal Suite|31675|Lower Devonian|417|8|isotopic, Rb/Sr|intrusion|Late Silurian|419|2.7|isotopic, U/Pb-Pb/Pb ion probe|magmatic crystallisation|||ACT|Yes|42820|42820|Abell, R.S.|29-OCT-90|Brakel, A.|26-OCT-90|BMR Bulletin 233. BD in 94/27660. BD as Federal Golf Course Granite in Chappell et al (1991).|Fine-grained, holocrystalline assemblage of plagioclase, hornblende, biotite and interstitial quartz tonalite (quartz diorite).|acid intrusive rock|||Y|I-type|24-JUL-23
Federal Suite|31675|||||Yes|Group, Suite|Formal|Other new published name|Briefly described|||||Lower Devonian||||intrusion|Late Silurian||||||||No|42726|||||||||||Y||17-JAN-23
Fyshwick Gravel|6942|||||Yes|Formation, beds|Formal|Unknown or process pending|Defined|||||Miocene||||deposition|Paleocene|||||||ACT|No|44970|44970|||||Permian age refuted by.Jennings (1972) and Ollier and Brown (1975). Age uncertain but likely to be in the Paleocene- Miocene range.|Quartz pebble gravel, coarse sandstone.||||N||17-JAN-23
Ginninderra Porphyry|7262|||||Yes|Formation, beds|Formal|Unknown or process pending|Defined|||||Ludlow||||intrusion|Ludlow|||||||NSW|No|36441|45147|M.Owen|27-AUG-74|||Card.|Intrusive red porphyry with quartz, plagioclase and mafic phenocrysts, rare K-feldspar megacrysts|acid intrusive rock|||Y|I-type|17-JAN-23
Gladefield Volcanics|7302|||||Yes|Formation, beds|Formal|Other new published name|Described|||||Late Silurian||||eruption|Silurian||||||||No|12185|||||||Acid lavas, tuff, ashstone, interbedded shale.|acid volcanic rock|||N||17-JAN-23
Greenwood Granite|7780|||||Yes|Formation, beds|Formal|Other new published name|Described|||||Lower Devonian||||intrusion|Late Silurian||||||||No|39800|||||||Biotite granite.|acid intrusive rock|||Y||17-JAN-23
Hattons Corner Group|8145|||||Yes|Group, Suite|Formal|Other new published name|Redefined|||||Lochkovian|||biozone|deposition|Ludlow|||biozone||||NSW|No|31852|68592||||||Fossiliferous shale, calcareous and non-calcareous mudstone, siltstone, black shale, limestone, minor quartz-lithic sandstone|fine grained siliciclastic rock|carbonate sedimentary rock||N||17-JAN-23
Hawkins Suite|8179|Hawkins Volcanic Suite|8182|||Yes|Group, Suite|Formal|Variation of published name|Described|||||Devonian|||||Silurian|434.8|4.3|isotopic, U/Pb-Pb/Pb ion probe|||||No|41563||||||Defined as Hawkins Volcanic Suite, but name subsequently simplified. Probably part of Bullenbalong Supersuite. See also RefID 67060 p505.|||||Y|S-type|17-JAN-23
Hawkins Volcanics|8184|||||Yes|Formation, beds|Formal|Other new published name|Defined|Douro Group|5668|Hawkins Suite|8179|Wenlock|428.8|1.9|inferred, intrusive relationship|eruption|Wenlock|434.8|4.3|inferred, isotopic correlation|magmatic crystallisation||1770|NSW|No|33325|68592|||||Assigned to the Bullenbalong Suite (Bullenbalong Supersuite) on Lachlan Fold Belt Granites map (1991). Assigned to the Hawkins Volcanic Suite in the Canberra 1:100k sheet area (1991), but this name simplified to Hawkins Suite (probably Bullenbalong Supersuite). Assigned to the Douro Group in the YASS 1:100k sheet area (1978). See also RefID 67060 p505.|Medium-coarse, massive, welded porphyritic dacitic-rhyolitic ignimbrite; subordinate medium-coarse, massive volcaniclastic sandstone, siltstone,mudstone and conglomerate; minor coherent dacite and rhyolite, very minor limestone and volcanic breccia.|acid volcanic rock|siliciclastic sedimentary rock||N|S-type|17-JAN-23
Hoskinstown Group|8512|||||Yes|Group, Suite|Formal|Other new published name|Defined|||||Ludlow|||inferred, biostratigraphic correlation||Wenlock|||inferred, biostratigraphic correlation|||5000|NSW|Yes|48878|42820|||||Previously Captains Flat Group (Glasson and Paine, 1965).||fine grained siliciclastic rock|igneous volcanic rock||N||17-JAN-23
Jervis Bay Sandstone|8945|||||Yes|Formation, beds|Formal|Variation of published name|Described|||||||||deposition|||||||||No|63233||||||See also Jervis Bay Sandstone"".|Includes; sandstone, conglomerate, siltstone.|siliciclastic sedimentary rock|||N||17-JAN-23
Kohinoor Volcanics, Copper Creek Shale|42279|||||Yes|Subgroup|Informal|Variation of published name|Not recorded|Hoskinstown Group|8512|||Late Silurian||||deposition|Late Silurian||||||||No|||||||Informal grouping of units to be used for New South Wales 1:1 million geological map, National Maps Project.|Rhyodacitic ignimbrite, agglomerate; dark grey shale, siltstone, limestone, quartzite with conglomerate|acid volcanic rock|siliciclastic sedimentary rock||N||05-SEP-23
Laidlaw Volcanics|10024|Laidlaw Formation|10016|||Yes|Formation, beds|Formal|Variation of published name|Redefined|Douro Group|5668|Laidlaw Volcanic Suite|10023|Ludlow|||inferred, biostratigraphic correlation|eruption|Llandovery|432.9|3.1|isotopic, U/Pb-Pb/Pb ion probe|magmatic crystallisation|150|1300|NSW|No|32106|68592|||||See also RefID 67060 p505. Minimum age from conodont fauna in Bowspring Limesone member of overlying Silverdale Formation.|Dark to light grey, very coarse-grained, porphyritic, rhyodacitic ignimbrite. Sporadically grades to a coarse-grained equigranular ignimbrite. lesser amounts of volcaniclastic sandstone, volcanic breccia, and minor airfall tuff. Rare columnar structure.|acid volcanic rock|siliciclastic sedimentary rock||N|S-type|17-JAN-23
Livingstone Porphyry|10511|||||Yes|Formation, beds|Formal|Resvd name published|Defined|||||Lower Devonian||||intrusion|Lower Devonian|||||||NSW|Yes|32820|36413|Richardson S.J.||Hawke, J.|20-FEB-79||Dacitic intrusive porphyry, minor xenoliths.|acid intrusive rock|||Y||17-JAN-23
London Bridge Formation|10603|||||Yes|Formation, beds|Formal|Unknown or process pending|Briefly described|||||Ludlow||||deposition|Ludlow||||||||No|12185||||||Name appears to be used interchangably with London Bridge Limestone.|Calcareous shale, limestone, sandstone, tuff, porphyry, altered acid lavas.|siliciclastic sedimentary rock|carbonate sedimentary rock||N||17-JAN-23
Lyons Ashstone|32172|||||Yes|Formation, beds|Informal|Variation of published name|Briefly described||||||||||||||||||No|43159|||||||||||N||17-JAN-23
McDonald Granite Porphyry|22286|||||Yes|Formation, beds|Formal|Resvd name published|Defined|||||Late Silurian||||eruption|Late Silurian|||||||ACT|No|36441|45147|D.Wyborn|27-AUG-74|||Card. Reserved as an ACT name. Publ. in BMR Bull 204. Defined. Also incorrectly published and indexed as McDonald Granite.|Porphyritic and K-feldspar megacryst-bearing granite.|acid intrusive rock|||Y|S-type|24-JUL-23
Mount Ainslie Volcanics|12438|Ainslie Volcanics|181|||Yes|Formation, beds|Formal|Variation of published name|Defined|Douro Group|5668|Hawkins Suite|8179|Wenlock||||eruption|Wenlock|||||700||ACT|Yes|39975|42820|Abell, R.S. (after Opik 1958)|26-OCT-90|Brakel, A.|26-OCT-90|BMR Bulletin 233. Approved by A. Waltho for NSW 17-MAY-1990. Canberra & Michelago 1:100k sheet areas. Equivalent to, but not yet formally included in, the Douro Group.|Dacitic ignimbrite, minor ashstone, agglomerate and shale; porphyry|acid volcanic rock|||N||17-JAN-23
Mount Painter Volcanics|24403|Mount Painter Porphyry|12996|||Yes|Formation, beds|Formal|Variation of published name|Redefined|Douro Group|5668|Hawkins Suite|8179|Wenlock||||eruption|Wenlock|430.7|2.2|isotopic, U/Pb-Pb/Pb ion probe|magmatic crystallisation||1000|ACT|Yes|35325|42820|Abell, R.S. (after Opik 1958)|29-OCT-90|Brakel, A.|26-OCT-90|Defined in BMR Bulletin 233. Canberra & Michelago 1:100k sheet areas. Equivalent to, but not yet formally included in, the Douro Group [2012].|Dacitic ignimbrite with lithic xenoliths and dacitic autoliths, tuffaceous sandstone and siltstone, minor tuff and ashstone|acid volcanic rock|||N|S-type|17-JAN-23
Mountain Creek Suite|32033|||||Yes|Group, Suite|Formal|Other new published name|Described|||||Lower Devonian|||||Lower Devonian||||||||No|43158|||||||||||Y||17-JAN-23
Mountain Creek Volcanics|13264|||||Yes|Formation, beds|Formal|Other new published name|Redefined|Black Range Group|1812|Mountain Creek Suite|32033|Emsian|406|1|isotopic, Rb/Sr|deposition|Silurian|420.3|3|isotopic, U/Pb-Pb/Pb ion probe|||5000|NSW|No|39800|22638|||||Of the Boggy Plain Suite (Boggy Plain Supersuite) on Lachlan Fold Belt granites map (Chappell et al (1991)).|Fine grained, feldspar phyric, rhyolitic-dacitic welded ignimbrite and flow banded lava. Lenses of volcaniclastic sandstone, siltstone and breccia; minor basal, polymictic, pebble-cobble conglomerate and pebbly sandstone; high mag susceptibility.|acid volcanic rock|siliciclastic sedimentary rock||N|I-type|17-JAN-23
Mugga Mugga Porphyry Member|24407|Mugga Mugga Porphyry|13330|||Yes|Member, phase|Formal|Unknown or process pending|Redefined|Deakin Volcanics|25874|||Ludlow|414|9|isotopic, Rb/Sr|tectonic process|Ludlow|||inferred, underlying unit|minimum depositional age||600|ACT|Yes|36633|42820|Abell, R.S. (after Henderson, G.A.M., after Opik 1958)|26-OCT-90|Brakel, A.|26-OCT-90|Defined in BMR Bulletin 233, Abell (1991). Maximum thickness measurements/estimates/guesstimates range from 300m to 600m. A radiometric age of 414+/-9Ma for the Mugga Mugga Porphyry Member relates to the intrusion of the younger Federal Golf Course tonalite which reset the isotopic chemistry of the porphyry.|Compact blue and mauve-grey porphyritic rhyodacite, volcaniclastic and waterlaid epiclastic tuff, tuffaceous shale.|acid volcanic rock|siliciclastic sedimentary rock||U||17-JAN-23
Mumbil Group|13411|Mumbil Formation|25307|||Yes|Group, Suite|Formal|Variation of published name|Defined|||||Pridoli|||||Llandovery||||||3000||No|32154|23170||||||Characterised by widespread shale, fine sandstone/siltstone and carbonate deposition, in many areas in conjunction with felsic volcanic eruptive centers of rhyolitic to dacitic composition.|siliciclastic sedimentary rock|acid volcanic rock||N||17-JAN-23
Mundoonen Sandstone|13443|Mundoonen Series|13446|||Yes|Formation, beds|Formal|Variation of published name|Fully described|Margules Group|69897|||Llandovery|||inferred|deposition|Katian|||inferred|deposition||||No|34405|||||||Thick-bedded massive to graded med-gr. granule quartzose to lithic-quartz sst.; thinly bedded, massive-fine- to med.gr.quartzose-lithic-qtz sst.interbedded with x-lam.sst; with 2 quartzose to lithic-quartz subunits, thinly and thickly bedded respectively.|siliciclastic sedimentary rock|||N||17-JAN-23
Muriarra Formation|13516|||||Yes|Formation, beds|Formal|Other new published name|Described|||||Ordovician||||deposition|Ordovician||||||||No|43385|||||||||||N||17-JAN-23
Murrumbateman Creek Formation|13560|||||Yes|Formation, beds|Formal|Other new published name|Defined|||||Early Silurian||||deposition|Early Silurian||||||900|NSW|Yes|12185|42820|Abell, R.S.|03-OCT-07||||Sandstone, siltstone and shale|siliciclastic sedimentary rock|||N||17-JAN-23
Narrabundah Ashstone Member|24420|Narrabundah Ashstone|13889|||Yes|Member, phase|Formal|Variation of published name|Redefined|Canberra Formation|3447|||Wenlock|||inferred, lithostratigraphic correlation|deposition|Wenlock|||inferred, lithostratigraphic correlation|||70|ACT|Yes|36633|42820|Abell, R.S. (after Opik 1958)|26-OCT-90|Brakel, A.|26-OCT-90|Defined in BMR Bulletin 233. Used in GSNSW seamless geology dataset 2021.|Massive tuffaceous arenite, fine to medium grained tuff, and ashstone.||||N||24-JUL-23
Nungar beds|14394|Nungar Beds|14392|||Yes|Formation, beds|Informal|Variation of published name|Fully described|||||Eastonian||||deposition|Darriwilian||||||||No|45147||||||See also Nungar Group, published 2007.|Quartz arenite, siltstone and shale (distal flysch sequence), black shale|siliciclastic sedimentary rock|||N||17-JAN-23
Ordovician sedimentary rocks 76682|76682|||||Yes|Formation, beds|Unnamed|Unnamed published|Mentioned|||||Upper Ordovician|434|||deposition|Lower Ordovician||||||||No|||||||Unnamed unit used in the 1:2.5 million scale Geology of Australia dataset|Predominantly sedimentary rocks; includes sedimentary rocks of low metamorphic grade and diapiric breccias|sedimentary rock|||N||17-JAN-23
Paddys River Volcanics|26093|||||Yes|Formation, beds|Formal|Other new published name|Defined|Douro Group|5668|Hawkins Suite|8179|Wenlock||||eruption|Wenlock|||||||ACT|No|12185|45147|||||To be replaced by Paddys River Volcanic Member, of Hawkins Volcanics? Canberra & Michelago 1:100k sheet areas. Equivalent to, but not yet formally included in, the Douro Group [2012]. This name used in GSNSW seamless geology dataset 2021.|Grey green dacite ignimbrite, limestone and shale lenses, minor rhyolite and andesite|acid volcanic rock|||N||17-JAN-23
Pittman Formation|15299|||||Yes|Formation, beds|Formal|Other new published name|Defined|Adaminaby Group|98|||Katian|||inferred, biostratigraphic correlation|deposition|Darriwilian|||inferred, biostratigraphic correlation|||2650|ACT|Yes|43385|42820|Abell, R.S. (after Opik 1958)|26-OCT-90|Brakel, A.|26-OCT-90|BMR Bulletin 233. Known as Foxlow beds on MICHELAGO (Refid 24128). Graptolite faunas of two different ages occur in the Pittman Formation - one of probable late Darriwilian age and the other (about 30m below the overlying Acton Shale) with Gisbornian affinities (Opik 1958). The Acton Shale Member  includes graptolites of Gisbornian to Bolindian age. Name proposed to be dropped in 2018 and rocks included in the Abercrombie Formation, except the Acton Shale Member, which was proposed to be included in the Warbisco Shale of the Bendoc Group. These proposed changes are not reflected in the GSNSW seamless geology 2021 which continues to use Pittman Formation and Acton Shale Member, although not including them in the Adaminaby Group.|Quartz-rich arenite, shale, siltstone, minor black shale, chert, impure calcareous arenite; turbidite|siliciclastic sedimentary rock|||N||17-JAN-23
Ryrie Formation|16491|||||Yes|Formation, beds|Formal|Resvd name published|Redefined|Yalmy Group|20777|||Early Silurian||||deposition|Early Silurian||||||1600|NSW|Yes|32820|36413|Richardson S.|01-JAN-75|Hawke, J.|20-FEB-79|Age: Llandovery. Equivalent to the Tombong Formation. 'Gungoandra Siltstone Member' excluded from this unit in 1994.|Quartzite and quartz-rich sandstone with minor interbedded siltstone and shale|siliciclastic sedimentary rock|||N||17-JAN-23
Shannons Flat Granodiorite|16803|Shannons Flat Adamellite|16801|||Yes|Formation, beds|Formal|Unknown or process pending|Described|||Shannons Flat Suite|31633|Lower Devonian|413|6|isotopic, Rb/Sr|intrusion|Late Silurian||||||||No|45003||||||This form of the name has come back into current use.|Foliated contaminated granodiorite|acid intrusive rock|||Y||17-JAN-23
Shannons Flat Suite|31633|||||Yes|Group, Suite|Formal|Other new published name|Briefly described|||Wyangala Supersuite|20701|Lower Devonian||||intrusion|Silurian||||||||No|42726||||||Parent information from Phil Blevin, NSWGS, April 2010.|||||Y||17-JAN-23
Silurian granites 76713|76713|||||Yes|Formation, beds|Unnamed|Unnamed published|Mentioned|||||Pridoli|410|||intrusion|Ludlow|420|||||||No|||||||Unnamed unit used in the 1:2.5 million scale Geology of Australia dataset|Mainly felsic intrusive rocks.  Range in composition from alkali feldspar granite to tonalite; includes associated rocks such as migmatite and minor gabbro and diorite.|acid intrusive rock|||Y||17-JAN-23
Silurian sedimentary rocks 76714|76714|||||Yes|Formation, beds|Unnamed|Unnamed published|Mentioned|||||Pridoli|410|||deposition|Llandovery|434|||||||No|||||||Unnamed unit used in the 1:2.5 million scale Geology of Australia dataset|Predominantly sedimentary rocks; includes sedimentary rocks of low metamorphic grade and diapiric breccias|sedimentary rock|||N||17-JAN-23
Silurian to Devonian felsic volcanics 76710|76710|||||Yes|Formation, beds|Unnamed|Unnamed published|Mentioned|||||Lower Devonian|384|||eruption|Ludlow|420|||||||No|||||||Unnamed unit used in the 1:2.5 million scale Geology of Australia dataset|Mainly felsic volcanics, including lavas and tuffs. Association may include volcaniclastic rocks.|acid volcanic rock|||N||17-JAN-23
Silurian to Devonian sedimentary rocks 76711|76711|||||Yes|Formation, beds|Unnamed|Unnamed published|Mentioned|||||Lower Devonian|384|||deposition|Ludlow|420|||||||No|||||||Unnamed unit used in the 1:2.5 million scale Geology of Australia dataset|Predominantly sedimentary rocks; includes sedimentary rocks of low metamorphic grade and diapiric breccias|sedimentary rock|||N||17-JAN-23
Silverdale Formation|16898|Hume Series|8574|||Yes|Formation, beds|Formal|Other new published name|Redefined|Hattons Corner Group|8145|||Ludlow|||biozone|deposition|Ludlow|||biozone||60.3|164|NSW|No|31852|68592|||||In the Canberra-Yass Shelf. Redefined in 2012 to exclude volcaniclastic units that are now part of underlying Yanawe Formation.|Basal well bedded, semi-nodular, fossiliferous limestone with shale interbeds; shaly mudstone with thin beds of turbiditic siltstone; minor siltstone and calcareous siltstone; topped by biomicrite interbedded with shaly mudstone.|carbonate sedimentary rock|siliciclastic sedimentary rock||N||17-JAN-23
State Circle Shale|17298|||||Yes|Formation, beds|Formal|Other new published name|Defined|||||Llandovery||||deposition|Llandovery|||biozone|||113|ACT|Yes|43385|42820|Abell, R.S. (after Opik 1958)|26-OCT-90|Brakel, A.|26-OCT-90|BMR Bulletin 233.|Shale, mudstone, siltstone and minor sandstone.|siliciclastic sedimentary rock|||N||17-JAN-23
State Circle Shale, Black Mountain Sandstone|42289|||||Yes|Subgroup|Informal|Variation of published name|Not recorded|||||Early Silurian||||deposition|Early Silurian||||||||No|||||||Informal grouping of units to be used for New South Wales 1:1 million geological map, National Maps Project.|Shale, mudstone, siltstone and minor sandstone; Sandstone, siltstone and minor shale|siliciclastic sedimentary rock|||N||17-JAN-23
Sutton Granodiorite|26154|||||Yes|Formation, beds|Formal|Unknown or process pending|Defined|||Sutton Suite|31639|Lower Devonian||||intrusion|Late Silurian|410|4|isotopic, Rb/Sr||||NSW|Yes|42820|42820||||||Granodiorite, monzogranite and quartz-feldspar porphyry|acid intrusive rock|||Y|I-type|02-JUN-23
Sutton Suite|31639|||||Yes|Group, Suite|Informal|Other new published name|Briefly described||||||||||||||||||No|42726|||||||||||Y||17-JAN-23
Tarpaulin Creek Ashstone Member|17862|||||Yes|Member, phase|Formal|Unknown or process pending|Fully described|Uriarra Volcanics|18992|||Late Silurian||||deposition|Late Silurian|||||||ACT|No|34405||||||Refers Malcolm(1954).|Fine-grained bedded tuff.||||N|I-type|24-JUL-23
Tharwa Adamellite|18032|||||Yes|Formation, beds|Formal|Unknown or process pending|Defined|||Shannons Flat Suite|31633|Lower Devonian||||intrusion|Late Silurian|414|6|isotopic, Rb/Sr||||ACT|No|45003|36413|||||Age quoted in Abell (1991) as being from Roddick & Compston (1976), who gave Rb/Sr total rock age of 423 +/6 Ma. Parent suite information from Phil Blevin, NSWGS, April 2010. Has this unit been incorporated into the Shannons Flat Granodiorite?|Biotite monzogranite|acid intrusive rock|||Y||17-JAN-23
Tidbinbilla Quartzite|18134|||||Yes|Formation, beds|Formal|Other new published name|Defined|||||Wenlock||||deposition|Llandovery||||||300|ACT|No|39800|45147|||||Shown as Black Mountain Sandstone on Abell et al 2008 - Geology of the ACT.|Massive to thin-bedded quartz sandstone and quartzite; minor shale, basal coarse gritstone|medium-coarse grained siliciclastic rock|||N||17-JAN-23
Uriarra Volcanics|18992|Uriarra volcanics|18993|||Yes|Formation, beds|Formal|Other new published name|Defined|||Laidlaw Volcanic Suite|10023|Late Silurian||||eruption|Early Silurian|||||||ACT|No|12185|45147||||||Dark grey to pink rhyodacite ignimbrite and air-fall tuff, fine-grained bedded ashstone|acid volcanic rock|||N||17-JAN-23
Walker Volcanics|19240|||||Yes|Formation, beds|Formal|Unknown or process pending|Defined|Douro Group|5668|Hawkins Suite|8179|Wenlock|||inferred, geological correlation|eruption|Wenlock|430.1|2.2|inferred, geological correlation|magmatic crystallisation||1500|ACT|No|36441|42820|||||Canberra & Michelago 1:100k sheet areas. Equivalent to, but not yet formally included in, the Douro Group [2012].|Green to purple dacite ignimbrite and bedded tuff, minor andesite, volcaniclastic sediment and limestone; calcareous and tuffaceous shale and siltstone|acid volcanic rock|||N||17-JAN-23
Wallace Shale|19257|||||Yes|Formation, beds|Formal|Other new published name|Fully described|Mumbil Group|13411|||Pridoli||||deposition|Pridoli||||||450||No|43385||||||Previously part of the Gamboola Formation.|Red and green shale, rare arenite; allochthonous megaclasts.|siliciclastic sedimentary rock|||N||17-JAN-23
Williamsdale Dacite Member|20085|Williamsdale Volcanics|26217|||Yes|Member, phase|Formal|Variation of published name|Redefined|Colinton Volcanics|4334|||Silurian||||magmatic crystallisation|Late Silurian|427.5|3.1|isotopic, U/Pb-Pb/Pb ion probe||2000|4000|NSW|Yes|49690||||||Essentially a redefinition of Richardson's Williamsdale Volcanics.|Massive rhyodacitic tuff to dacitic ignimbrite, minor rhyolitic intrusions.|acid volcanic rock|||N||17-JAN-23
Woodlawn Volcanics|20516|||||Yes|Formation, beds|Formal|Resvd name published|Defined|Mount Fairy Group|26052|||Lochkovian|419|3.2|isotopic, U/Pb-Pb/Pb ion probe|eruption|Wenlock||||||1500|NSW|Yes|30730||Felton E.A.||Bryan, J.H.|27-OCT-75|Age is indistinguishable from Ellenden Granite and leucogranite phase of Lockhart Igneous Complex, but younger than the tonalite phase of Lockhart Igneous Complex.|Flow banded, commonly amygdaloidal, porphyritic rhyolite; rare matrix-supported polymictic conglomerate; fine to coarse-grained, poorly sorted rhyolitic volcanic sandstone, tuffaceous siltstone and grey shale, uncommon siliceous ironstone.|acid volcanic rock|||N||17-JAN-23
Yarralumla Formation|20879|||||Yes|Formation, beds|Formal|Other new published name|Defined|Douro Group|5668|Laidlaw Volcanic Suite|10023|Lochkovian|417|8|inferred, intrusive relationship|metamorphism|Ludlow|||biozone|deposition|100|300|ACT|Yes|43385|42820|Abell, R.S. (after Opik 1958)|29-OCT-90|||BMR Bulletin 233. Approved by A. Waltho 17-MAY-1990? Included in the Laidlaw Volcanic Suite for stratigraphic relations with Deakin Volcanics. Geol Survey NSW has included it within the Douro Group (Yass area). Formerly included in 'Red Hill Group' of Opik.|Calcareous and tuffaceous mudstone and siltstone with minor limestone, calc-silicate hornfels and quartz sandstone|fine grained siliciclastic rock|||N||17-JAN-23
Yarwood Siltstone Member|20902|Lower Trilobite Bed|31221|||Yes|Member, phase|Formal|Other new published name|Defined|Black Bog Shale|1776|||Ludlow|||inferred, biostratigraphic correlation|deposition|Ludlow|||inferred, biostratigraphic correlation||5|33.5|NSW|No|31852|68592|||||Formerly known as the 'Lower Trilobite Zone' (Mitchell, 1886),  "Lower Trilobite bed".|Fossiliferous calcareous mudstone, shale, siltstone; rare pods of micritic limestone.|fine grained siliciclastic rock|||N||17-JAN-23
Yass Formation|20908|Yass Subgroup|20917|||Yes|Formation, beds|Formal|Variation of published name|Defined|Douro Group|5668|Laidlaw Volcanic Suite|10023|Ludlow||||deposition|Wenlock||||||320|NSW|No|43479|68592|||||See also Yass Beds of Jenkins (1878), Yass Member, Yass Group, Yass Sub-Group. Now (since 1979) Yass Formation.|Upward coarsening quartzose to quartzofeldspathic sandstone and laminated mudstone (some calcareous), siltstone and shale; fossiliferous limestone.|siliciclastic sedimentary rock|carbonate sedimentary rock||N||17-JAN-23
alluvium 38485|38485|||||Yes|Formation, beds|Unnamed|Unnamed published|Briefly described|||||Holocene||||deposition|Holocene||||||||No|||||||Unit is to be used as part of a "standard set" of symbols for National Maps Project. Map Symbol: Qa.  May have been previously mapped as Qy (Qyt); some Qcc and Czca.|Channel and flood plain alluvium; gravel, sand, silt, clay; may be locally calcreted|regolith|||N||17-JAN-23
colluvium 38491|38491|||||Yes|Formation, beds|Unnamed|Unnamed published|Briefly described|||||Quaternary||||deposition|Quaternary||||||||No|||||||Unit is to be used as part of a "standard set" of symbols for National Maps Project.  Map symbol: Qrc. May have been previously mapped as Qc, Czc, Qrg; some Czr and Czca.|Colluvium and/or residual deposits, sheetwash, talus, scree; boulder, gravel, sand; may include minor alluvial or sand plain deposits, local calcrete and reworked laterite|regolith|||N||17-JAN-23
felsic intrusives 42189|42189|||||Yes|Formation, beds|Unnamed|Unnamed published|Mentioned|||||Triassic||||intrusion|Permian||||||||No|||||||Lithology referring to an unnamed unit to be used for Australian 1:1 million geological map, National Maps Project. Also surface/subsurface unit interpreted by Alastair Stewart for GA Solid Geology layer in Chinchilla 1:250k sheet area.|Felsic intrusive rocks; including tonalite, diorite, granodiorite, granite, monzogranite, rhyolite, microgranodiorite|acid intrusive rock|||N||17-JAN-23
lake deposits 38492|38492|||||Yes|Formation, beds|Unnamed|Unnamed published|Briefly described|||||Quaternary||||deposition|Quaternary||||||||No|||||||Unit is to be used as part of a "standard set" of symbols for National Maps Project.  Map symbol: Qt.|Lake and swamp deposits; mud, silt, evaporites, limestone; minor sand, peat|regolith|||N||17-JAN-23
sedimentary rocks 72357|72357|sandstone 74489|74489|||Yes|Formation, beds|Unnamed|Unnamed published|Described|||||Cenozoic||||deposition|Cenozoic||||||||No|||||||Lithology referring to an informal unnamed unit to be used for Australian 1:1 million geological map, National Maps Project. Also to be used for subsurface unit interpreted by Tony Meixner for the basement geology of the Exploring for the Future area. A more specific WA sandstone unit, used in 2010, was incorporated into this broader 'unit' in the 2012 Surface Geology.|Undifferentiated consolidated Cenozoic sedimentary rocks; sandstone, limestone, conglomerate, siltstone, coal, duricrust; commonly ferruginised or silicified; may be poorly consolidated, highly weathered, and dissected by present day drainage.|siliciclastic sedimentary rock|regolith||N||17-JAN-23
