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From Wikipedia, the free encyclopedia
The Walloon Coal Measures are a Late Jurassic geologic subgroup in Queensland, Australia. Deposited within the Surat Basin, it is considered Oxfordian to early Tithonian in age based on lead-uranium dating of tuffites within the unit.[1]
Walloon Coal Measures | |
---|---|
Stratigraphic range: Oxfordian-early Tithonian ~ | |
Type | Subgroup |
Unit of | Injune Creek Group |
Sub-units | Juandah Coal Measures, Maclean Sandstone Member, Tangalooma Sandstone, Taroom Coal Measures, Mutdapilly fossil locality |
Underlies | Springbok Sandstone |
Overlies | Hutton Sandstone, Eurombah Formation |
Thickness | 420–700 m (1,380–2,300 ft) |
Lithology | |
Primary | Shale, sandstone, siltstone |
Other | Coal, limestone |
Location | |
Coordinates | 27.0°S 152.6°E |
Approximate paleocoordinates | 67.2°S 93.3°E |
Region | Queensland |
Country | Australia |
Extent | Surat & Clarence-Moreton Basins |
Type section | |
Named for | Walloon |
Named by | Dudgeon |
Year defined | 1982 |
The 420 to 700 metres (1,380 to 2,300 ft) thick formation comprises thin-bedded, claystones, shales, siltstones, lithic and sublithic to feldspathic arenites, coal seams and partings and minor limestone. The formation is laterally equivalent to the Mulgildie Coal Measures and Birkhead Formation.[2]
The formation, in the Jurassic in the South Polar region, has provided fossil flora and trace fossils of theropods, ornithopods and Changpeipus bartholomaii and Garbina roeorum.[3][4] The dinosaur Rhoetosaurus is known from the unit.[1] 11 tracks are known from the formation, mostly those of large (prints 30-75 centimetres in length) theropods.[5]
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