The Cotter Formation is a geologic formation in Arkansas, Missouri,Thompson, Thomas L., 2001, Lexicon of Stratigraphic Nomenclature in Missouri, Missouri Department of Natural Resources, Division of Geology and Land Survey, Report of Investigation Number 73, p 72-3 Oklahoma and in Virginia. It preserves fossils dating back to the Ordovician period.
See also
List of fossiliferous stratigraphic units in Arkansas List of fossiliferous stratigraphic units in Virginia Paleontology in Arkansas Paleontology in Virginia
References