Tempo and Mode in Evolution Genetics and Paleontology 50 Years After Simpson (1995) / Chapter Skim
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Macroevolution
Macroevolution
Pages 85-86
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From page 85... ...
Raup in Chapter 6, because Darwin attached considerable significance to extinction, and because species extinctions have of necessity been just about as common as originations, living species representing the small surplus cumulated over millions of years. Raup concludes that mass extinctions have been of great consequence in restructuring the biosphere, because successful groups become eliminated, thereby empowering previously constrained groups to expand 85
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From page 86... ...
One concerns nongradual transitions, such as punctuated equilibrium and mass extinction; the other calls for an expansion of the theory of natural selection to levels both below and above organisms. Whence the topological configuration of vascular land plants?
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