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Evolutionary tempo and mode in a sequence of the Upper Cretaceous bivalve Pleuriocardia

Published online by Cambridge University Press:  08 April 2016

Dana H. Geary
Dana H. Geary*
Affiliation:
Department of Geology and Geophysics, 1215 W. Dayton Street, University of Wisconsin, Madison, Wisconsin 53706
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Abstract

This study addresses the question of evolutionary tempo and mode in a sequence of Upper Cretaceous bivalves in the genus Pleuriocardia from the Western Interior Basin of North America. Change between species was probably phyletic (without persistence of ancestors). There is some evidence for weak gradual change within the lineage, but most important change is concentrated in short intervals of time. Detailed examination of the differences among samples reveals pronounced geographic variation, whereas temporal variation within localities is generally minor. The relatively rapid episodes of change fit the model of punctuated equilibrium, but the phyletic nature of species-level change does not.

The value of the debate about the punctuated and gradualistic models has been to force a more criticial examination of fossil sequences, but these sequences should not be forced into narrowly defined categories. A variety of evolutionary patterns may exist in the fossil record, and it is this variation in pattern that will inform us of the underlying processes.

Type
Articles
Information
Paleobiology , Volume 13 , Issue 2 , Spring 1987 , pp. 140 - 151
Copyright
Copyright © The Paleontological Society 

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