ABSTRACT

The Cretaceous-Tertiary boundary stages and formations are discussed, both on the basis of the type localities and their occurrence in other regions, and evidence is supplied as to their correlation by means of the planktonic Foraminifera. The Montian is considered to be equivalent to the Danian, and both are of lower Paleocene age, and contain a Globigerina planktonic faunal assemblage. The Landenian (middle and upper Paleocene) contains a Globigerina and keeled Globorotalia assemblage, which is subdivided into planktonic faunal zones on the basis of various species of Globorotalia. The Globorotalia velascoensis zone is considered to be the uppermost Paleocene. The planktonic Foraminifera of the Midway and basal Wilcox groups of Alabama and Texas, the Brightseat and Aquia formations of Maryland, and the Hornerstown and Vincentown formations of New Jersey are described, the planktonic foraminiferal zonation is discussed and the various Paleocene and lower Eocene zones are correlated interregionally.

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