Michigan Peninsula
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Strata (plural of stratum), is the geological formation of an area of land. A sequence of discrete rock layers used for age dating and identification of concurrent regional or worldwide events in the geologic record. Section from East to West across the peninsula of Michigan. The Several groups of strata from the Coal measures to the Lower Silurian.
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Winchell, Alexander Sketches of Creation (New York, NY: Harper & Brothers, 1870)
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