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Geological eras and periods
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Allegany County anhydrite argillaceous average daily oil barrels beds black shale Bradford district Bradford field Bradford pool Bradford Second Bradford Third sand brown carbonate Cattaraugus Cattaraugus County Charles Butts Chemung Chipmunk chocolate-brown sandstone conglomerate connate water core Creek crystalline dark brownish-gray dark chocolate-brown dark grayish-brown Dark greenish-gray sandy Dark greenish-gray shale Dark-gray shale Depth in feet Description of strata Devonian drilled Feet Feet feet Top Bot flne fossiliferous Gray sandy shale gray shale Grayish-black shale grayish-brown sandstone Greenish-gray sandy shale hard fine-grained chocolate horizon intake interbedded greenish-gray July June Knapp Lewis Run light greenish-gray sandstone light-gray sandstone limestone little interbedded McKean County miles moderately hard fine-grained oil and water oil production Olean Pennsylvania Percent sandstone permeability Petroleum porosity salt water samples sand body Sept show of oil slightly calcareous Sugar Run Table thin seams Total depth water input water production