Show simple item record Orr, R. William 2006-08-07T14:42:57Z 2006-08-07T14:42:57Z 1971
dc.identifier.citation Orr, R. William, 1971, Conodonts from Middle Devonian Strata of the Michigan Basin. Indiana Geological Survey Bulletin 45, 110 p., 4 fig., 6 pl. en
dc.description Indiana Geological Survey Bulletin 45 en
dc.description.abstract Study of the stratigraphic distribution of 20 species of the platform genera Icriodus, Polygnathus, Palmatolepis?, and Schmidtognathus at 11 subsurface localities in northern Indiana and at 10 supplementary outcrop localities in northern Indiana, Michigan, and western Ontario makes possible the recognition of five conodont zones in middle Devonian strata of the Michigan Basin. The lower part of the Detroit River Formation of northern Indiana contains a fauna characterized by Polygnathus angusticostatus, P. robusticostatus, and P. “webbi.” This faunal association is similar to that of the Spathognathodus bidentatus Zone (Eifelian) of Europe. The upper Eifelian fauna of the Dundee Limestone of Michigan, Ohio, and western Ontario, which is characterized by Icriodus angustus, is not present in northern Indiana, where the Detroit River is succeeded unconformably by the Traverse Formation. The lower part of Traverse strata of Indiana and the Bell Shale, Rockport Quarry Limestone, Ferron Point Formation, Genshaw Formation, Newton Creek Limestone, and lowermost part of the Alpena Limestone (all the Traverse Group) of Michigan contain a lower Givetian fauna distinguished by I. latericrescens latericrescens below the lowest position of P. varcus. The upper part of the Traverse Formation of Indiana and the upper part of the Alpena Limestone and the Four Mile Dam Limestone, Norway Point Formation, Potter Farm Formation, and Thunder Bay Limestone (all the Traverse Group) of Michigan lie within the P. varcus Zone (upper Givetian). The lowermost part of the Antrim Shale of northern Indiana contains the fauna of the Schmidtognathus hermanni-P. cristatus Zone of probable late middle Devonian (Givetian) age. Forty -four species of conodonts that are referable to 18 genera are present in the collection. The new taxon Icriodus latericrescens robustus is proposed herein. en
dc.description.sponsorship Indiana Department of Natural Resources en
dc.format.extent 7116001 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Indiana Geological Survey en
dc.relation.ispartofseries Bulletin en
dc.relation.ispartofseries 45 en
dc.rights This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. To view a copy of this license, visit or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA. en
dc.subject Paleontology en
dc.subject Biostratigraphy en
dc.subject Conodonta en
dc.subject Fossils en
dc.subject Microfossils en
dc.subject Detroit River Group en
dc.subject Traverse Group en
dc.subject Michigan Basin en
dc.subject Indiana en
dc.subject Michigan en
dc.title Conodonts from Middle Devonian Strata from the Michigan Basin en
dc.type Technical Report en

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