The distribution, relationships, and stratigraphieal significance of the microfaunas (mainly foraminifera) in the Upper Cretaceous deposits of Western Australia are discussed, and palaeogeography and palaeoecology considered.Formations deposited during the Cenomanian--Turonian are the Gearle Siltstone and Alinga Greensand and perhaps the Moleeap Greensand. Among the foraminifera recorded are the stratigraphically restricted planktonic forms Globotruncana (Praeglobotruncana) stephani subspp, and G. helvetica.

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