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1 - Introduction

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

The simple desire to understand the world we live in has driven scientists for more than two centuries to study the history of life through time. It soon became evident to the early workers that this history is most certainly not a continuous one. Indeed, the recognition of sudden and fundamental changes in faunas and floras through time led to the designation of the segments of Earth history that we know as geological periods. The two greatest discontinuities in life's history, since organisms evolved fossilizable hard parts, are the mass extinctions that define the boundaries of three great segments of Earth history, the Palaeozoic, the Mesozoic and the Cenozoic eras.

What caused these and many other changes in the Earth's biota? For a long time palaeontologists have realized that faunal and floral changes are the result of either evolutionary innovations or of environmental changes at many different scales. This volume addresses biotic changes through time for a wide variety of organisms from tiny single-celled calcareous nannoplankton to the largest whale. We concentrate on the past 145 million years of Earth history because this is a large enough segment of time to allow us to evaluate both geologically instantaneous global environmental changes and environmental trends that take millions of years to unfold.

Type
Chapter
Information
Biotic Response to Global Change
The Last 145 Million Years
, pp. 1 - 3
Publisher: Cambridge University Press
Print publication year: 2000

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