Foraminifers of the Esna shales, which lie at the base of the Eocene in Egypt and overlie the upper Cretaceous Chalk beds, are shown to comprise a transitional faunal assemblage displaying Cretaceous affinities in the lower shales and Eocene affinities in the upper zone. Continuous deposition from the Cretaceous to the Eocene is apparent at the five localities examined, and is supported by the paleontological evidence. Foraminifers identified from the Chalk, shales, and Eocene beds are listed, and a number of new species and varieties are described.

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