"Records in detail the planktonic foraminifera of the section, as well as the reefal assemblages that are intercalated in and cap the Esna shale of this oasis. The planktonic forms have been given only moderate consideration by previous workers. The age of the Esna shale of Farafra is established as upper Paleocene; many of the primitive Nummulites and Alveolina species that occur in this succession are thus shown to be of upper Paleocene age. This work demonstrates by paleontological methods the presence of an unconformity between the Maestrichtian and the upper Paleocene, thus resolving an 80-year-long controversy.

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