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Media type:
E-Article
Title:
Evolution and Evolutionary Biostratigraphy of Carboniferous Ammonoids
Contributor:
Ramsbottom, W. H. C.;
Saunders, W. B.
Published:
Society of Economic Paleontologists and Mineralogists and the Paleontological Society, 1985
Published in:
Journal of Paleontology, 59 (1985) 1, Seite 123-139
Language:
English
ISSN:
0022-3360;
1937-2337
Origination:
Footnote:
Description:
Ammonoids are among the most satisfactory fossils for use in stratigraphic correlation, because of their nektonic mode of life, potential for postmortem distribution and rapid evolution. Many Carboniferous basinal and marginal open-sea faunal successions are dominated by ammonoids, and assemblages of 10 to 20 genera are not uncommon. Ammonoids are also abundant in some shelf successions, though virtually absent from others. The richest and best known Carboniferous ammonoid successions are in western Europe, the Soviet Union (South Urals, Donetz Basin and Middle Asia), North America and North Africa (Algeria and Morocco). The appearance of new or modified morphological features provides the basis for recognition of some 12 important events in the evolution of the ammonoids that are common to all these successions. A total of 17 ammonoid-based zones may be used to subdivide the Carboniferous. Since they are founded on evolutionary changes and appear in all successions studied, these divisions provide a good basis for the erection of intercontinental chronostratigraphic divisions.