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Simpson, George Gaylord definitions

Britannica Concise

U.S. paleontologist. Born in Chicago, he earned a doctorate at Yale Univ. His contributions to evolutionary theory include a detailed classification of mammals, based on his studies of mammalian evolution, which is still the standard. He is also known for his studies of intercontinental migrations of animal species, especially S. Amer. mammals, in past geologic times. His books include Tempo and Mode in Evolution (1944, 1984), The Meaning of Evolution (1949), The Major Features of Evolution (1953), and The Principles of Animal Taxonomy (1961).



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