The Trimmers Rock Formation contains sandstone, siltstone, silt shale, and silty clay shale.
2.
The rock underlying the dam is Ohio Black Shale which is a largely hard, massive silt shale.
3.
Chagrin shale, is blue gray in color, an offshore alluvial, silt shale of the Devonian period.
4.
Named for the Chagrin River and easily found in the river valley, Chagrin shale is blue gray in color, an offshore alluvial, silt shale of the Devonian period.
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