| Pope Mega Group | |
|---|---|
| Stratigraphic range:Carboniferous | |
| Type | Geological group |
| Sub-units |
|
| Overlies | Mammoth Cave Group |
| Lithology | |
| Primary | Sandstone, Limestone, Shale |
| Location | |
| Region | Illinois Basin |
| Country | United States of America |
ThePope Mega Group is a geologic unit found in theIllinois Basin of southernIllinois, southwesternIndiana, and westernKentucky.[1][2] InIndiana andKentucky its equitant is theBuffalo Wallow Group. This unit grades fromsandstones at its base into mix oflimestones and sandstone and then ashale at its top.[3] In Southern Illinois oil wells are drilled into the Tar Springs formation.[4]
Also known at theKinkaid 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.
A 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]
This sandstone unit is 0-150' thick.
This unit is 0-150’ thick. Its units include the Ford Station Limestone, Tygett Sandstone and Cora Limestone Members.
This sandstone unit is 0-120' thick.
TheMenard Limestone is ageologic formation in theIllinois Basin of southernIllinois, southwesternIndiana, and westernKentucky.
The type section of both the Walche Limestone Member and the Scottsburg Limestone Member are exposures in Walche's Cut, a railway cutting on theIllinois Central Railroad.[6][7][8]
This formation is 0-100’ thick.
This limestone unit is 0-60' thick
This 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.
TheGlen Dean Formation is ageologic formation inIllinois, Indiana andKentucky. It preservesfossils dating back to theCarboniferousperiod.
TheHardinsburg Formation is ageologic formation inIllinois, Indiana andKentucky. It preservesfossils dating back to theCarboniferousperiod.
TheHaney Formation is ageologic formation inIllinois, Indiana andKentucky. It preservesfossils dating back to theCarboniferousperiod.
TheFraileys Formation orFraileys Shale is ageologic formation inIllinois. It preservesfossils dating back to theCarboniferousperiod.
TheBeech Creek Formation is ageologic formation inIllinois, Indiana andKentucky. It preservesfossils dating back to theCarboniferousperiod.
TheCypress Formation is ageologic formation inIllinois, Indiana andKentucky. It preservesfossils dating back to theCarboniferousperiod.
TheRidenhower Formation is ageologic formation inIllinois. It preservesfossils dating back to theCarboniferousperiod. It includes the Reelsville Member, Sample Member and Beaver Bend Member.
TheBethel Formation is ageologic formation inIllinois, Indiana andKentucky. It preservesfossils dating back to theCarboniferousperiod.
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