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Correlation of the Gulf and Atlantic Coastal Plain Paleocene and Lower Eocene Formations by Means of Planktonic Foraminifera

Alfred R. Loeblich, Jr. and Helen Tappan
Journal of Paleontology
Vol. 31, No. 6 (Nov., 1957), pp. 1109-1137
Stable URL: http://www.jstor.org/stable/1300498
Page Count: 29
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Correlation of the Gulf and Atlantic Coastal Plain Paleocene and Lower Eocene Formations by Means of Planktonic Foraminifera
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Abstract

Stages and formations at the Cretaceous-Tertiary boundary are discussed on the basis of their type localities and their equivalents in other regions, with evidence presented as to the stratigraphic value of their planktonic foraminiferal assemblages for local and interregional correlation. The planktonic assemblages are recognized to be of worldwide extent; the stages each have a characteristic generic aspect. The Globotruncana assemblage is characteristic of Upper Cretaceous strata, and is followed by a nearly complete change in generic character in later beds. An identical Globigerina assemblage occurs in the type Danian, in the type Montian, and in the lower part of the Midway group. The Danian is therefore regarded as of early Paleocene age; the Landenian (upper Paleocene) contains a Globigerina-keeled Globorotalia assemblage, and the Ypresian (lower Eocene) has a Globigerina-keeled Globorotalia-Truncorotaloides assemblage. A more detailed zonation at the specific level is proposed. The planktonic assemblages are here utilized for age determination and correlation of the Brightseat and Aquia formations of Maryland and Virginia, the Hornerstown and Vincentown formations of New Jersey, the Midway group of the Gulf Coast area, and the Salt Mountain and Nanafalia formations of Alabama. These strata are correlated with others in Mexico, the Caribbean area, western Europe, the Middle East, and North Africa. The stratigraphic nomenclature and age designations in this report do not necessarily follow the usage of the U. S. Geological Survey.

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