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9 - Response of shallow water foraminiferal palaeocommunities to global and regional environmental change

Published online by Cambridge University Press:  14 August 2009

Stephen J. Culver
Affiliation:
East Carolina University
Peter F. Rawson
Affiliation:
University College London
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Summary

INTRODUCTION

How do communities of organisms respond to environmental change? In this chapter we address this question using a group of organisms with an excellent fossil record, shallow water benthic foraminifera (Fig. 9.1). To set the scene, we first provide an overview of the Cretaceous to Recent history of these organisms in shallow water settings and then summarize the environmental context for our detailed studies of Cenozoic foraminiferal palaeocommunities in eastern North America. We then show that the temporal framework of major environmental perturbations, as well as the evolutionary framework within which these changes occurred, affect the way in which shallow water benthic foraminifera have responded to regional and global environmental change. We note that there is no simple pattern of cause and effect. There are many exceptions to any generalities and no set of conditions is ever repeated exactly through geological time.

OVERVIEW OF CRETACEOUS TO RECENT HISTORY OF SHALLOW WATER BENTHIC FORAMINIFERA

Two major episodes of global perturbations of shallow water benthic foraminifera occurred during the Cretaceous, one in the middle and one at the end. The oceanic anoxic events of the Late Barremian to Early Campanian affected water as shallow as 100 to 150 m (Hart, 1985).

Type
Chapter
Information
Biotic Response to Global Change
The Last 145 Million Years
, pp. 122 - 134
Publisher: Cambridge University Press
Print publication year: 2000

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