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Evolutionary Transition from Ammonite Subprionocyclus to Reesidites- Punctuated or Gradual?

Philip D. Gingerich
Evolution
Vol. 32, No. 2 (Jun., 1978), pp. 454-456
DOI: 10.2307/2407612
Stable URL: http://www.jstor.org/stable/2407612
Page Count: 3
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Evolutionary Transition from Ammonite Subprionocyclus to Reesidites- Punctuated or Gradual?
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