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Morphology and morphologic diversity of mid-Carboniferous (Namurian) ammonoids in time and space

Published online by Cambridge University Press:  08 February 2016

W. Bruce Saunders  and
Andrew R. H. Swan
W. Bruce Saunders
Affiliation:
Department of Geology, Bryn Mawr College, Bryn Mawr, Pennsylvania 19010
Andrew R. H. Swan
Affiliation:
Department of Geology, University College of Swansea, Singleton Park, Swansea SA2 8PP, U.K.
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Abstract

Morphologic analysis of 281 species of ammonoids from Great Britain, the North American mid-continent, and the South Urals, at eight successive levels within the Namurian Series (ca. 18 Myr duration), using bivariate plots and principal-components analysis, permits definition of morphologic diversity and identification of morphotypic patterns in time and space. Namurian ammonoids exhibit the same general range of shell geometry that characterizes ammonoids as a whole; there were few post-Namurian innovations in the basic geometry of planispiral ammonoids. Within this overall range of geometry, there are eight preferred morphotypes: two were phylogenetically monopolized by long-ranging forms; three were generalized and reoccur in successive horizons; two others were homeomorphically utilized at different times by different lineages; and one represents morphologic innovation followed by radiation. Such patterns seem to represent combined effects of function, phylogeny, and ecology. Synchronous variations in isolated successions suggest global controls such as eustatic sea-level fluctuations, whereas provincial differences in diversity may be attributable to paleogeographic and ecologic factors. We predict that the Namurian record of ammonoid morphologic diversity and change will be found to be distinctive and differentiable from earlier and later intervals.

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Type
Research Article
Information
Paleobiology , Volume 10 , Issue 2 , Spring 1984 , pp. 195 - 228
Copyright
Copyright © The Paleontological Society 

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References

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