Abstract

Cincinnatian (Upper Ordovician) strata in eastern Hamilton County, Ohio, are grouped according to their respective clastic-ratio and bedding-index values. Statistical analysis of cross-bedding in 14 pararipple sets indicates that paleocurrent flow in this area was directed southwest while the sediments of the Kope and Fairview Formations accumulated. An east- or northeast-trending shoal controlled the local distribution of lithosomes, although its influence may have decreased during deposition of the Miamitown Shale. Shifting positions of benthonic invertebrate colonies, of associated shallow depressions, and of wave and slightly changing current systems account for the formation of discontinuous limestone lenses intertongued with pelitic units.

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