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20 feet Anacostia Anne Arundel County Aquia Areal Distribution.—The arenaceous argillaceous artesian Arundel formation beds beneath Calvert County Calvert formation Character of Materials.—The Choptank formation Cliffs Coastal Plain color contain Creek crystalline rocks depth diatomaceous earth drab Eocene erosion estuaries exposed feet thick formation receives forms fossils glauconite gneiss gravel greensand horizon ice-borne boulders indurated Lafayette formation land lenses lignite lithologic loam locally Magothy formation marls MARYLAND GEOLOGICAL SURVEY Matawan Matawan formation mile Miocene Monmouth obtained occur outcrop overlain overlies oxide Paleontologic Patapsco formation Patuxent formation Patuxent River Piedmont Piscataway places Pleistocene portion Potomac group Potomac River Prince George's County Raritan formation receives its name region sand sandstone scarp SEDIMENTARY shells shore slope southeast strata Stratigraphic Relations.—The streams Sunderland supply of water surface Talbot formation terrace Thickness.—The strike tion unconformably underlying Upper Cretaceous Upper Marlboro valley vicinity Washington Wicomico Wicomico formation Xanjemoy Xew Jersey