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Post details: Gould, S.J. - "Evolution's Erratic Pace"

11/04/04

by ARN Staff 04:30:09 pm, Categories: Stasis, Fossil Evidence, 83 words

Gould, S.J. - "Evolution's Erratic Pace"

The history of most fossil species include two features particularly inconsistent with gradualism:

1) Stasis - most species exhibit no directional change during their tenure on earth. They appear in the fossil record looking much the same as when they disappear; morphological change is usually limited and directionless;

2) Sudden appearance - in any local area, a species does not arise gradually by the steady transformation of its ancestors; it appears all at once and 'fully formed'.

Gould, S.J. (1977)
"Evolution's Erratic Pace"
Natural History, vol. 86, May

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