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The upper Reedsville Formation and portions of equivalent Martinsburg strata (Upper Ordovician) in the central Appalachians provide one of the earliest known examples of a prolific clastic-facies invertebrate fauna with a distinctly modern aspect….
Upper Ordovician, ecology, central Appalachians
Bretsky, Peter W.. 1970. "Upper Ordovician ecology of the central Appalachians." Bulletin of the Peabody Museum of Natural History , (34). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/34