
Contents
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The Genesis of Punctuated Equilibria The Genesis of Punctuated Equilibria
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“February 1965” “February 1965”
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“April 1968” “April 1968”
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Phacops rana: Evolution in Time and in Space, 1966–1969 Phacops rana: Evolution in Time and in Space, 1966–1969
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“The Allopatric Model and Phylogeny in Paleozoic Invertebrates,” 1971 “The Allopatric Model and Phylogeny in Paleozoic Invertebrates,” 1971
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Punctuated Equilibria Punctuated Equilibria
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“The Process of Speciation and Interpretation of the Fossil Record,” 1970 “The Process of Speciation and Interpretation of the Fossil Record,” 1970
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“Punctuated Equilibria: An Alternative to Phyletic Gradualism,” 1972 “Punctuated Equilibria: An Alternative to Phyletic Gradualism,” 1972
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Stasis: The Big Gorilla in the Room Stasis: The Big Gorilla in the Room
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Stasis, Darwin, and the Strong Corollary Stasis, Darwin, and the Strong Corollary
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5 Punctuated Equilibria: Speciation and Stasis in Paleontology, 1968–
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Published:March 2015
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Abstract
This chapter delves into the development of the theory of punctuated equilibria, widely known as “punk eek.” Punctuated equilibria integrates the idea of the origin of species through geographic isolation with the near-universal pattern of stasis. Stasis refers to the event in which most species do not seem to exhibit any form of change for the duration of their lives, often over millions of years. Despite the difficulty of tracing steady, gradual modification of an ancestral species into an undoubted descendant, new species still unexpectedly show up in the fossil record. The imagery caught in punctuated equilibria thus appears to be relatively rapid bursts of evolution interrupting longer periods of non-change of species.
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