Rolling Downs Group

The Rolling Downs Group is a stratigraphic group present in the Eromanga and Surat Basins in the northwestern to southwestern parts of Australia, which was deposited between the mid Barremian to early Turonian of the Cretaceous period. It primarily consists of nearshore shallow marine sediments deposited in the Eromanga Inland Sea, though the uppermost and terminal members, the Winton Formation and the Griman Creek Formation represents freshwater deposits. It is notable for its fossil content including many dinosaurs and mammals, as well as opal. A relict species of dicynodont was suggested to have been found in these rocks, but is more likely to be misidentified pieces of a Cenozoic marsupial from younger sediments.