Tempo and Mode in Evolution

George Gaylord Simpson (1902-1984) was one of the most influential American paleontologists of the twentieth century. In the new introduction he wrote for this edition of his 1944 book, Simpson states, "My main aim was to explore and in a way to exploit the fact that paleontology is the only four-dimensional biological science: time, 'tempo,' is inherent in it. Thus the aim of this book, which I think it accomplished, was to bring this dimension squarely, methodologically, into the study of evolutionary theory."

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