A number of stratigraphically restricted species of Foraminifera are found in the late Cretaceous-early Tertiary of Australia and California. These cosmopolitan species are also found in many other parts of the world, often under different names. They have been noted in samples collected here for the Richfield Oil Corporation and for the Bureau of Mineral Resources in Northwest Australia. Their identification permits direct or indirect correlation with standard European stages and thus contributes to a universal stratigraphy, as well as to the knowledge of paleogeography. In addition, the widespread occurrence of index Foraminifera for the Maestrichtian and Danian-Paleocene often permits an exact distinction between uppermost Cretaceous and lowermost Tertiary.

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