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Biogeographic and evolutionary patterns of continental margin benthic foraminifera

Published online by Cambridge University Press:  08 April 2016

Martin A. Buzas
Affiliation:
Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560
Stephen J. Culver
Affiliation:
Department of Geological Sciences, Old Dominion University, Norfolk, Virginia 23508

Abstract

Several very large, taxonomically standardized data sets have been compiled and utilized to investigate biogeographic and evolutionary patterns of continental margin benthic foraminifera. Mean partial species durations for 87 frequently occurring and 180 rarely occurring species on the Atlantic continental margin of North America are the same, namely 21 m.y. The global fossil record of these species indicates no center or centers of origin and indicates very rapid dispersal. The Miocene had the greatest number of first occurrences with 46%, followed by the Pleistocene, Pliocene and Oligocene with approximately 13% each. The remaining 14% first occur in the Eocene, Paleocene, and Cretaceous. Species with a wide geographic distribution often exhibit longer species durations than those with narrow geographic ranges. The vast majority of endemic species (150 of 175) occur rarely and have no fossil record.

Information

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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