In Queensland the Lower Cretaceous limestones and marls contain a large assemblage of bivalves, the more important of which are Nucula truncata ([Fig. 94 A]), Maccoyella reflecta ([Fig. 94 B]), M. barkleyi, Pecten socialis and Fissilunula clarkei ([Fig. 94 C]), from Wollumbilla; and Inoceramus pernoides, I. carsoni and Aucella hughendenensis from the Flinders River (the latter also from New South Wales).
In the Lake Eyre District of S. Australia we find Maccoyella barkleyi, which also occurs in Queensland and New South Wales (at White Cliffs), Trigonia cinctuta, Mytilus rugocostatus and Modiola eyrensis. The handsome bivalve, Pleuromya plana occurs near Broome in W. Australia.
A—Nucula truncata, Moore. L. Cretaceous. South Australia
B—Maccoyella reflecta, Moore sp. Up. and L. Cretaceous. Q’land.
C—Fissilunula clarkei, Moore sp. Up. and L. Cretaceous. Q’land.
D—Inoceramus carsoni, McCoy. L. Cretaceous. Queensland
E—Cyrenopsis opallites, Eth. fil. Up. Cretaceous. New South Wales
F—Conchothyra parasitica, Hutton. Cretaceous. New Zealand
Upper Cretaceous Bivalves.—
The Upper Cretaceous or Desert Sandstone at Maryborough, Queensland, has yielded amongst others, the following shells:—(Nucula gigantea, Maccoyella reflecta also found in the Lower Cretaceous of Queensland, New South Wales and S. Australia), and Fissilunula clarkei (also found in the L. Cretaceous of New South Wales, Queensland and S. Australia). Some of these beds, however, which were hitherto believed to belong to the Upper and Lower Series respectively may yet prove to be on one horizon—the Lower Cretaceous. Cyrenopsis opallites ([Fig. 94 E]) of White Cliffs, New South Wales, appears to be a truly restricted Upper Cretaceous species.
The Cretaceous of New Zealand (Amuri System) contains Trigonia sulcata, Inoceramus sp. and the curious, contorted shell, Conchothyra parasitica ([Fig. 94 F]) which is related to Pugnellus, a form usually considered as a sub-genus of Strombus.
From Papua an Inoceramus has been recorded from probable Cretaceous beds.