Wallumbilla Formation

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Wallumbilla Formation
Type Geological formation
Thickness 600 metres
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]


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[edit]


  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.