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Three-dimensionally preserved specimens of Amplexograptus (Ordovician, Graptolithina) from the North American mid-continent: taxonomic and biostratigraphic significance

Published online by Cambridge University Press:  14 July 2015

Daniel Goldman ,
Shannon M. Campbell  and
Jeffrey M. Rahl
Daniel Goldman
Affiliation:
1Department of Geology, The University of Dayton, Ohio 45469,
Shannon M. Campbell
Affiliation:
1Department of Geology, The University of Dayton, Ohio 45469,
Jeffrey M. Rahl
Affiliation:
2Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511
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Extract

Graptolites are relatively uncommon fossils in the Middle and Upper Ordovician carbonates of the North American mid-continent. With the notable exception of the Viola Springs Formation in Oklahoma, most units contain a single species, which occur within narrow stratigraphic intervals (often single beds). While uninteresting in terms of their diversity, these monospecific collections commonly yield excellent three-dimensionally preserved specimens that can be isolated from their matrix and studied. In particular, the large number of well-preserved specimens allows for accurate evaluations of intra-specific variation and reliable descriptions of taxa that are generally known from flattened or otherwise distorted material. Additionally, these graptolite collections can provide important biostratigraphic ties between disparate facies—shallow mid-continental limestones and the deeper-water black shales characteristic of continental margins.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 76 , Issue 5 , September 2002 , pp. 921 - 927
Copyright
Copyright © The Paleontological Society

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