“…Here the immediately overlying upper member of the Ohio shale, the Cleveland member, is lithologically similar, but differs in that it contains thin beds of gray shale, siltstone, and siliceous limestone in the lower part. Eastward the tough grayishblack shale of the Cleveland iiiterfingers with the Chagrin shale, thinning to a feather edge in eastern Ashtabula Comity (Pepper, de Witt, and Demarest, 1954 …”