Named as a member of the Strasburg cyclothem. Named for Columbiana Co., OH. Formerly and incorrectly called Columbiana Shale Member of the Hamden Limestone by Denton and others (1961). Incorrectly called Hamden Limestone by Stout (1916). Type exposures in Brookwood Hollow in section 29, Perry Township, Columbiana Co., OH. Also refer to Ohio Division of Geological Survey measured stratigraphic section OGS 3778. No other occurrence information given. Fossiliferous black and gray shale with fossiliferous nodular limestone. Approximately 5.5 ft thick. Overlies the Lower Kittanning coal. No underlying unit given. No age given [Pennsylvanian].

Source: GNU records (USGS DDS-6; Reston GNULEX).

Columbiana Member is found in Allegheny Formation between Lower and Middle Kittanning coals. Replaces use of the name Hamden limestone in OH. Extends into PA and is probably equivalent to Obryan Member in southern OH and northeastern KY (see Rice and others, same volume).

Source: GNU records (USGS DDS-6; Reston GNULEX).

Columbiana Member of Allegheny Formation in OH was mistakenly referred to as "Hamden" limestone by Stout (1918, 1927). Columbiana is widespread and well-defined east and northeast of Flint Ridge, OH, where it is commonly ferruginous and ranges from less than 0.3 m to as much as 1.2 m thickness. Described by Stout (1918) as nodular, very irregular in shape and size, and containing fusulinids and brachiopods. In places in northern OH and PA, basal part of Columbiana contains a dark-gray, fossiliferous, argillaceous limestone bed as much as 0.6 m thick. Correlated in OH with the newly named Obryan Member of the Breathitt Formation in KY and of Allegheny Formation in southern OH. Both Obryan and Columbiana contain conodonts including new species of HINDEODUS as well as a species of NEOGNATHODUS that differs from that of underlying Vanport Limestone Member.

Source: GNU records (USGS DDS-6; Reston GNULEX).