Influence of Local Bedrock on the Clay Mineralogy of Pre-Woodfordian Tills of the Grand River Lobe in Columbiana County, Ohio
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Citation:The Ohio Journal of Science. v88, n5 (December, 1988), 174-180
The clay mineralogy of three pre-Woodfordian tills of the Grand River lobe in Columbiana County, Ohio, shows the influence of the underlying Pennsylvanian strata of the Allegheny Plateau. The mean diffraction intensity ratios (DI) of these sandy tills range from 0.5 to 0.7. These ratios are comparable to those of the underlying bedrock; 60% of the variance of the clay mineralogy may be attributed to the bedrock. Weathered bedrock and weathered older drift are possible sources of kaolinite. Locally entrained Pennsylvanian sandstone clasts at the base of the glacier may have acted as tools for extensive abrasion of softer argillaceous shales. This abrasion may have produced tills having a higher kaolinite content than those near the edge of the Allegheny Escarpment in north-central Ohio.
Author Institution: Department of Geology, University of Akron
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