Size analyses, mineralogy of both heavy and light fractions of sand-size material, and differential thermal analysis of clay-size material indicate that the Aquia Formation was derived predominantly from the Piedmont, Blue Ridge, and Valley and Ridge provinces and deposited in inner neritic waters. Both authigenic and detrital glauconite are recognized and the heavy mineral suite lacks only hornblende. Illite, montmorillonite, and kaolinite make up the clay fraction.

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