Abstract
Paleocurrent indicators in thin, shallow marine calcarenites of the Kope and Fairview Formations (Upper Ordovician) in an area immediately west of Cincinnati exhibit great directional variability. Taken collectively, cross-bedding data plot as a polymodal pattern with two pairs of roughly opposing modes: N.-S.SW., and SE.-W.NW.; the vector mean is S.SW. and has a low consistency factor. Stratigraphical grouping of the data produces a significant difference between the vector means of the two formations, although low consistency factors remain; the mean trend of Kope paleocurrents is westerly, and that of the Fairview is southerly. The ripple marks (megaripples) in the calcarenites of the Kope Formation have wave lengths ranging from 43 to 152 cm., and average 81.6 cm. The corresponding dimensions for those in the Fairview are 40, 137, and 70.4 cm. Ripple indices for both formations are slightly more variable than the wave lengths, but the means are identical, having a value of 13.4. A significant decrease...
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