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1
The American Upper Ordovician standard: VII. Stratigraphy and petrology of the Cynthiana and Eden formations of the Ohio Valley
by Weiss, Malcolm P. (Malcolm Pickett), 1921-
New York [Geological Society of America] 1965
Subjects: “...Geology Nomenclature....”

Book
2
Ordovician K-bentonites of eastern North America /
by Kolata, Dennis R.
Boulder, Colo. : Geological Society of America, 1996
Subjects: “...Geology, Stratigraphic Ordovician....”

Book
3
Graptolites from the Lower Ordovician Pogonip Group of western Utah /
by Braithwaite, Lee F.
Boulder : Geological Society of America, 1976
Subjects: “...Ordovician Geologic Period. fast (OCoLC)fst01353916...”

Book
4
Community paleoecology as a geologic tool : the Chinese Ashgillian-Eifelian (latest Ordovician through early Middle Devonian) as an example /
Boulder, Colo. : Geological Society of America, 1987
Subjects: “...Devonian Geologic Period. fast (OCoLC)fst01352702...”

Book
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