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Alleghany County Analysis of units Appalachian Valley Augusta County banded Beekmantown belt of Ordovician Botetourt County Buchanan Clifton Forge cobbly Coeymans Colliers Creek compact Conococheague contains Covered interval dark bluish-gray dark-gray dolomite and limestone Eagle Rock Edinburg Elbrook exposed exposures Feet Ordovician limestone Fincastle following section Geologic Section gray Helderberg group high-calcium limestone high-magnesium dolomite James River district Keyser limestone Lexington Licking Creek limestone light-gray lime Limestone and dolomite limestone and shale Lincolnshire and Whistle Lincolnshire limestone locality mapped Market limestone medium-grained MgCO3 miles northeast miles southwest Murat limestone facies Natural Bridge Station nodular northwest Ordovician dolomite Ordovician limestone belt percent calcium carbonate percent magnesium carbonate percent silica Pulaski-Staunton fault Road Rockbridge County sampled thickness sandstone sandy shale shaly silica siliceous southwestward sparsely cherty Steeles Tavern thick-bedded Thickness Feet Ordovician U. S. Highway 220 upper vicinity Virginia Thickness Feet Waynesboro weathers Whistle Creek limestones