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Pope Mega Group
The Pope Mega Group is a geologic unit found in the Illinois Basin of southern Illinois, southwestern Indiana, and western Kentucky.[1][2] In Indiana and Kentucky its equitant is the Buffalo Wallow Group. This unit grades from sandstones at its base into mix of limestones and sandstone and then a shale at its top.[3] In Southern Illinois oil wells are drilled into the Tar Springs formation.[4] StratigraphyKinkaid FormationAlso known at the Kinkaid Limestone, this unit is made up of several smaller members. This unit ranges from 0' - 230 ' thick. The Grove Church Shale is at the top, followed by Members, Goreville Limestone, Cave Hill Shale, and Negli Creek Limestone. Tobinsport FormationA formation in Illinois containing 4 members that are linked to other formations in the Upper Pope Group. The Negli Creek Limestone of the Kinkaid formation to the west. Mt. Pleasant Sandstone, Bristow Sandstone, and Siberia Limestone. The Siberia is a thin tongue of the Menard formation.[5] Degonia FormationThis sandstone unit is 0-150' thick. Clore FormationThis unit is 0-150’ thick. Its units include the Ford Station Limestone, Tygett Sandstone and Cora Limestone Members. Palestine FormationThis sandstone unit is 0-120' thick. Menard FormationThe Menard Limestone is a geologic formation in the Illinois Basin of southern Illinois, southwestern Indiana, and western Kentucky. The type section of both the Walche Limestone Member and the Scottsburg Limestone Member are exposures in Walche's Cut, a railway cutting on the Illinois Central Railroad.[6][7][8] Waltersburg FormationThis formation is 0-100’ thick. Vienna FormationThis limestone unit is 0-60' thick Tar Springs FormationThis sandstone unit is 0-150' thick. The Tar Springs consists of interbedded sandstone and shale, creating closed reservoirs within the sand. For this reason it is the largest oil producing formation in Illinois. Estimated to have accounted for more than 60% of the oil production in the state. Glen Dean FormationThe Glen Dean Formation is a geologic formation in Illinois, Indiana and Kentucky. It preserves fossils dating back to the Carboniferous period. Hardinsburg FormationThe Hardinsburg Formation is a geologic formation in Illinois, Indiana and Kentucky. It preserves fossils dating back to the Carboniferous period. Haney FormationThe Haney Formation is a geologic formation in Illinois, Indiana and Kentucky. It preserves fossils dating back to the Carboniferous period. Fraileys FormationThe Fraileys Formation or Fraileys Shale is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period. Beech Creek FormationThe Beech Creek Formation is a geologic formation in Illinois, Indiana and Kentucky. It preserves fossils dating back to the Carboniferous period. Cypress FormationThe Cypress Formation is a geologic formation in Illinois, Indiana and Kentucky. It preserves fossils dating back to the Carboniferous period. Ridenhower FormationThe Ridenhower Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period. It includes the Reelsville Member, Sample Member and Beaver Bend Member. Bethel FormationThe Bethel Formation is a geologic formation in Illinois, Indiana and Kentucky. It preserves fossils dating back to the Carboniferous period. Energy Production
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