Walloon Coal Measures

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.

Description
The 420 to 700 m 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.

Fossil content
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. The dinosaur Rhoetosaurus is known from the unit. 11 tracks are known from the formation, mostly those of large (prints 30-75 centimetres in length) theropods.