Punctuated equilibria; the tempo and mode of evolution reconsidered

@article{Gould1977PunctuatedET,
  title={Punctuated equilibria; the tempo and mode of evolution reconsidered},
  author={S. Gould and N. Eldredge},
  journal={Paleobiology},
  year={1977},
  volume={3},
  pages={115-151}
}
We believe that punctuational change dominates the history of life: evolution is concentrated in very rapid events of speciation (geologically instantaneous, even if tolerably continuous in ecological time). Most species, during their geological history, either do not change in any appreciable way, or else they fluctuate mildly in morphology, with no apparent direction. Phyletic gradualism is very rare and too slow, in any case, to produce the major events of evolution. Evolutionary trends are… Expand
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