Conodont biostratigraphy and comparison with graptolite zones in the Upper Kope Formation in north central Kentucky

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1982

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The Ohio State University

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The zonal ranges of some key graptolites and conodonts have remained unclear in the Cincinnati region. This has caused uncertainty regarding the position of the Maysvillian Stage base as it travels through lithic units in this area. This study has more closely determined the Amorphognathus superbus - Amorphognathus ordovicicus zonal boundary and studied its relationship to the Climacograptus spiniferus - Climacograptus pygmaeus zonal boundary. The data has revealed that, in the Cincinnati region, these two zonal boundaries lie in closer stratigraphic proximity than previously thought. Both of these boundaries were found to be early Maysvillian in age. Also, it was determined that the Maysvillian Stage base lies in the C. spiniferus - C. pygmaeus transitional zone.

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