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20 feet Anacostia River 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 Columbia 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 Jersey Lafayette formation land layers lenses lignite lithologic loam locally Magothy formation marine marls MARYLAND GEOLOGICAL SURVEY Matawan Matawan formation mile Miocene Muirkirk Nanjemoy obtained occur outcrop 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 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 valley vicinity Washington Wicomico Wicomico formation