Wallumbilla Formation

Wallumbilla Formation
Stratigraphic range: Barremian–Albian
Type Geological formation
Unit of Rolling Downs Group
Sub-units Trimble Member, Ranmoor Member, Jones Valley Member, Doncaster Member, Coreena Member
Underlies Toolebuc & Griman Creek Formations
Overlies Cadna-Owie & Bungil Formations
Thickness 600 m (2,000 ft)
Lithology
Primary Mudstone, siltstone
Other Sandstone, limestone
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 the Coreena, Doncaster, Jones Vally, Ranmoor, and Trimble Members.[1]

Paleofauna

Paleofauna of the Wallumbilla 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

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.
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