Thoughts on the evolution and extinction of Cretaceous ammonites
Problems that beset the worker on Cretaceous ammonites - chronostratigraphic, biostratigraphic and evolutionary - are reviewed, and examples of evolutionary patterns noted. Problems of stratigraphic nomenclature are illustrated by the base of the Turonian stage. The possible lengths of ammonite zone...
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| Formaat: | Journal article |
| Taal: | English |
| Gepubliceerd in: |
1989
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