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Middle Ordovician Lophospira (Archaeogastropoda) from the Upper Mississippi Valley

Published online by Cambridge University Press:  14 July 2015

Jane Evans Tofel  and
Peter W. Bretsky
Jane Evans Tofel
Affiliation:
Department of Earth and Space Sciences, State University of New York, Stony Brook 11794
Peter W. Bretsky
Affiliation:
Department of Earth and Space Sciences, State University of New York, Stony Brook 11794
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Abstract

A detailed morphological study of over 2,500 Middle Ordovician (Black Riveran) lophospirid archaeogastropods from the lower half of the Platteville Formation (Pecatonica Member and Mifflin Submember of the McGregor Member), principally as it is exposed in southern Wisconsin, has permitted the definition of five species of Lophospira. Lophospira perangulata (Hall), L. milleri (Hall), L. serrulata (Salter), L. helicteres (Salter), and L. delicata (n. sp.) are preserved throughout a three-meter interval of fine-grained, heavily bioturbated carbonates, now dolomitized. Deposition took place on a broad, shallow tropical shelf, which was characterized by low rates of deposition and low physical energy. The sampled interval represents about 500,000 years. The benthic marine invertebrate fauna is well preserved, diverse, and characteristic of an environment of normal marine salinity.

Of the five Lophospira species, only one, L. perangulata, has been positively identified in older strata (late Whiterockian, eastern North America). The other four species were endemic to the interior seas, and apparently at least two of these, L. serrulata and L. helicteres, did not survive into post-Platteville (post-Black Riveran) environments. Changes in the proportions of lophospirid species from the Pecatonica into the Mifflin strata probably reflect subtle changes in the distribution of carbonate shelf habitats but no major alteration in the kinds of habitats available for colonization.

Type
Research Article
Information
Journal of Paleontology , Volume 61 , Issue 4 , July 1987 , pp. 700 - 723
Copyright
Copyright © The Paleontological Society 

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