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Map showing configuration of bedrock surface in the District of Columbia region In pocket 2 Map showing depth to bedrock in part of Washington ...
A Gravel of Potomac group on gneiss Harvard Street east of entrance to Zoological Park B Plateau gravel
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altitude America Bull anticline bedrock bedrock surface beds bluffs Brassfield Brussels formation Brussels quadrangles Burlington limestone calcareous Calhoun County Cap au Gres chert clay coarse Creek crystalline Deer Plain Deer Plain formation deposits depth Devonian diameter dolomite east erosion exposed exposures fault feet thick flood plains fossils Geology grains gray Gres flexure Grover gravel Hannibal shale Hardin and Brussels Hardin quadrangle holes Illinoian Illinois Geol Illinois River Jersey County Jour Kimmswick layers Lincoln anticline Lincoln County lithologic loess Louis limestone lower Maquoketa miles Mississippi River Mississippi Valley Missouri oolite outcrop overlain overlying Ozark pebbles peneplain Pennsylvanian Peter sandstone Pleistocene Potomac group Pottsville probably quartz region remnants rock samples sand sandy sea level sediments seems shale silt Silurian slope southern Calhoun County stratigraphic streams Street Survey Bull thin tion top of formation U. S. Geol unconformity uplift upper weathered Weller