Trepostome bryozoa from the Dillsboro Formation (Cincinnatian Series) of southeastern Indiana (1985)

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Authors: George Brown
Edward Daly

Cyphotrypa madisonensis, Dekayia mesospinosa, Peronopora sparsa, and Stigmatella acanthera. Eleven previously recognized species are placed in synonymy, and two homonyms are identified." style="width:400px; height:120px;">ABSTRACT: Bryozoans of the order Trepostomata are probably the most numerous taxa of fossils in the Cincinnatian Series in southeastern Indiana in species and numbers. Recent reappraisal of these strata has revealed the complex facies relationships rather than the earlier presumed "layer-cake" geology. This complexity has prompted a new look at these fossils to determine exactly how they relate to these facies. Bryozoans were collected from the Dillsboro Formation in 5-foot zones at two localities that included the base of the formation and at two that included the top. Tables in this report show the distributions of the species. The Dillsboro is assigned to the Maysvillian and Richmondian Stages and was established to provide a convenient stratigraphic unit in place of numerous units of confusing distribution and relationships. Fifty-three species of bryozoans are identified from 18 genera. Four new species are reported: Cyphotrypa madisonensis, Dekayia mesospinosa, Peronopora sparsa, and Stigmatella acanthera. Eleven previously recognized species are placed in synonymy, and two homonyms are identified.



Brown, G. D., Daly, E. J. 1985,  Trepostome bryozoa from the Dillsboro Formation (Cincinnatian Series) of southeastern Indiana: Indiana Geological Survey Special Report 33, 95 p., 1 fig., 12 pl.


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Keywords: paleontology, Dillsboro Formation, Ordovician, bryozoa

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