TWO LATE ORDOVICIAN ASTEROIDS (ECHINODERMATA) WITH CHARACTERS SUGGESTIVE OF EARLY OPHIUROIDS

Conodont biostratigraphy and depositional history of strata comprising the Niagaran sequence (Silurian) in the northern part of the Cincinnati Arch region, west-central Ohio, and evolution of Kockelella walliseri (Helfrich)

The paleoecology of a Late Ordovician shale unit from Southwest Ohio and southeastern Indiana

Problems of sexual dimorphism, population structure and taxonomy of the Ordovician genus Tetradella (Ostracoda)