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Rates of evolution in some Cenozoic planktonic foraminifera

William A. Berggren
Rates of evolution in some Cenozoic planktonic foraminifera
Micropaleontology (1969) 15 (3): 351-365


Morphologic and taxonomic rates of evolution within some groups of Cenozoic planktonic foraminifera have been calculated. Taxonomic rates of evolution vary from a low of 0.11 species per million years in the genus Orbulina to 1.44 species per million years in the Neogene globorotaliids. The rate of change in the total fauna (rate of origination minus rate of extinction) shows negative values in the late Eocene and early Oligocene and in the late Miocene to Pleistocene, reflecting, in all likelihood, two crises which the planktonic foraminifera experienced during the Cenozoic. Taxonomic frequency data are plotted against a paleotemperature curve for the middle Eocene-Pleistocene interval (Devereux, 1967). Some striking similarities are seen, and possible relationships are discussed.

ISSN: 0026-2803
Serial Title: Micropaleontology
Serial Volume: 15
Serial Issue: 3
Title: Rates of evolution in some Cenozoic planktonic foraminifera
Pages: 351-365
Published: 1969
Text Language: English
Publisher: American Museum of Natural History, New York, NY, United States
Accession Number: 1969-032917
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1969
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