Bibliographic references: The Sedimentological and Paleontological Characteristics of the Portersville Shale, Conemaugh Group, Southeast Ohioin which chronostratigraphic unit is the base: Moscovianrank: Group status: regionalin which chronostratigraphic unit is the top: Ghzelianurl: http://tin.er.usgs.gov/geology/state/sgmc-unit.php?unit=OHPAc%3B0 Glossary: Gzhelian Add new comment You must have JavaScript enabled to use this form. Your name Subject Comment * More information about text formats CAPTCHAThis question is for testing whether or not you are a human visitor and to prevent automated spam submissions. What code is in the image? * Enter the characters shown in the image.
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