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abundant actinolite animals anticline beds biotite blue bluffs calcite calcite veins carbonate cells cellulose nitrate cent Chengtu chert chlorite clays climate coal colloid color country rock Creek crystalline crystals deposits developed dikes diorite dips dolomite drift east eggs emulsion erosion farther feet feldspar folds formation forms fossils Geological Giles County glacial gorge grained gray Halifax Heartwellville hill inches indicate iron lake layers limestone lower manganese marble meanders metamorphism mica miles north minerals mountains nearly Oberlin College occur Ohio Ordovician outcrops oxide pebbles peneplain percent phosphate places plain Pond present probably pyrite quartz quartzitic Readsboro region ridges river road Rockwood sand sandstone schist sea water sediments seems sericite shale Shenandoah Sherman side slopes solution stibnite strata stream structure substances surface temperature terraces thickness thin thyroid tion upper valley Virginia weathering West Branch Whitingham