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Silurian (Llandovery/Wenlock) foraminiferida in carbonate environments of southeastern Wisconsin

Published online by Cambridge University Press:  20 May 2016

Rodney Watkins ,
Kathleen A. Walsh  and
Jeffrey J. Kuglitsch
Rodney Watkins
Affiliation:
Department of Geology, Milwaukee Public Museum, 800 West Wells Street, Milwaukee, Wisconsin 53233,
Kathleen A. Walsh
Affiliation:
Department of Geology, University of Georgia, Athens 30602,
Jeffrey J. Kuglitsch
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, Madison 53706,
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Extract

This note presents the first stratigraphic, paleoenvironmental, and systematic account of Silurian foraminifers in Wisconsin, which include nine previously described species of Ammodiscus, Glomospirella, Hemisphaerammina, Hyperammina, Lagenammina, Psammosphaera, Stomasphaera, Thurammina, and Webbinelloidea (Appendix 1). Early Silurian carbonates in this area (Fig. 1) were deposited in shelf and ramp environments in the western part of the Michigan Basin (Harris et al., 1998), and the foraminifers are associated with macrofaunal communities that represent Benthic Assemblages BA3 to BA5 of Brett et al. (1993).

Silicified agglutinated foraminifers were obtained from acidinsoluble residues processed for conodonts, sponge spicules, and macrofauna (Watkins et al., 1994; Kuglitsch, 1996; Watkins and Kuglitsch, 1997; Watkins and Coorough 1997a, 1997b). Silicification of the specimens, rather than a composition of agglutinated siliceous grains, is indicated by lack of detrital silica in enclosing dolostones, variable detail of preservation, and association with other silicified fossils.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 73 , Issue 3 , May 1999 , pp. 540 - 546
Copyright
Copyright © The Paleontological Society 

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