[24990] North American, Strata: Middle Ordovician, Period: 22487, Rec 976

[Rec № 976] Dispersal centers of Paleozoic and later clastics of the upper Mississippi Valley and adjacent areas

Potter, P. E. & Pryor, W. A.
Geol. Soc. Amer. Bull., 1961, , Vol 72
Pages 1195 - 1250 , Total Record: 14