Cincinnatian Series
Uppermost rocks of the Ordovician System, defined on the basis of exposures seen around the region of Cincinnati, Ohio, where they consist of numerous limestone formations that are richly fossiliferous. (The Ordovician Period lasted from 505 to 438 million years ago.) To the south and west of Cincinnati, the deposits are fragmentary, whereas deposits found in the Appalachian
posted by StickySpade @ 4:58 AM
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