Citation

Jensen, A.R., 1975. Permo-Triassic stratigraphy and sedimentation in the Bowen Basin, Queensland. Bulletin  154. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

Part of the Permo-Triassic succession in the Bowen Basin consists of coal measures (Blackwater Group) overlain by a redbed sequence (Rewan Group) and a sequence composed essentially of quartz-rich sandstone (Clematis Group). The succession attains a maximum thickness of 3500 m. This study discusses the stratigraphy and controls of sedimentation, mainly from observations in the northern half of the basin. The coal measures were formed at the close of the Permian when earth movements created a rapidly subsiding intermontane basin, possibly with an internal drainage system. The Rewan Group was laid down in the same drainage basin in a system of meandering and anastomosing channels, in response to a decreased rate of subsidence relative to the rate of supply of sediment. The red colour of the mudstone is due to the presence of finely divided hematite derived from red soils in the source area. When the rate of sediment supply exceeded the rate of subsidence, a major reorganization of the drainage system took place, together with a general increase in stream gradients as sandy sediment accumulated along the margin of the basin. Changes of relief in the source area, and in the type of vegetation, local climate, and rates of erosion and subsidence, led to podsolic weathering in both the source area and at the site of deposition; fossil soil profiles can now be recognized by the application of micropedological analysis to the mottled red and green mudstone of the basal part of the Clematis Group. The newly established system of braided and meandering channels spread sand from the northern and southwestern parts of the area towards the southeast, where the rate of subsidence was greatest.
Google map showing geographic bounding box with values North bound -10.0 East bound 149.5 West bound 137.0 South bound -28.5
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Product Type/Sub Type

dataset - GA Publication - Bulletin

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1975

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Bulletin
stratigraphy
geology
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-10.0
East bound
149.5
West bound
137.0
South bound
-28.5

Lineage

Unknown

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-b346-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

1996-10-29

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays