Wallumbilla Formation

Wallumbilla Formation
Type	Geological formation
Thickness	600 metres
Location
Region	Queensland
Country	Australia

The Wallumbilla Formation is a Lower Cretaceous geologic formation found in Australia. Plesiosaur remains are among the fossils that have been recovered from its strata.

The formation is present in the Northern Territory, Queensland, South Australia, and New South Wales. It is a sedimentary unit, principally made up of mudstone and siltstone, with calcareous concretions. Its maximum thickness is 600 metres. Its age is somewhere from Aptian to Albian, that is between 113 and 98 Mya. The formation is part of the Wilgunya Sibgroup, which in turn is part of the Rolling Downs Group of the Eromanga and Surat Basins. The named beds are: Coreena, Doncaster, Jones Vally, Ranmoor, and Trimble Members.^[1]

Paleofauna

Placeholders of the Placeholder Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Notopala Cotton, 1935	† Notopala albascopularis (Etheridge, 1902)	White Cliffs, New South Wales			the oldest freshwater snail in Australia[2]

See also

• Plesiosaur stratigraphic distribution

References

1. Geoscience Australia: Stratigraphic Units Database
2. Kear B. P., Hamilton-Bruce R. J., Smith B. J. & Gowlett-Holmes K. L. (2003). "Reassessment of Australia's oldest freshwater snail, Viviparus (?) albascopularis Etheridge, 1902 (Mollusca : Gastropoda : Viviparidae), from the Lower Cretaceous (Aptian, Wallumbilla Formation) of White Cliffs, New South Wales". Molluscan Research 23(2): 149-158. doi:10.1071/MR03003, PDF.