Bibliographic references: International Stratigraphic Chartabsolute age of base: 311700kyerror in absolute age of base: 0%Containing Unit: Pennsylvanianrank: Epoch/Series status: globalGlossary: Middle Pennsylvanian 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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