State | Pennsylvania |
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Name | Keyser Formation through Mifflintown Formation, undivided |
Geologic age | Devonian and Silurian |
Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone (Bed)Bloomsburg Formation--grayish-red and greenish-gray shale, siltstone, sandstone, and mudstone;
Sedimentary > Carbonate > Limestone (Bed)Tonoloway Formation--limestone; Wills Creek Formation--limestone; Mifflintown Formation--interbedded shale and limestone.
Sedimentary > Clastic > Mudstone > Shale (Bed)Tonoloway Formation--interbedded shale; Wills Creek Formation--interbedded shale; Bloomsburg Formation--grayish-red and greenish-gray shale; Mifflintown Formation--interbedded shale
Minor
Sedimentary > Clastic > Sandstone (Bed)Bloomsburg Formation--grayish-red and greenish-gray shale, siltstone, sandstone, and mudstone
Sedimentary > Clastic > Siltstone (Bed)Wills Creek Formation--interbedded shale, siltstone, limestone, and dolomite; Bloomsburg Formation--grayish-red and greenish-gray shale, siltstone, sandstone, and mudstone.
Sedimentary > Carbonate > Dolostone (Bed)Wills Creek Formation--interbedded shale, siltstone, limestone, and dolomite
|
References | Berg, T.M., Edmunds, W.E., Geyer, A.R., and others, compilers, 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 1, 2nd ed., 3 sheets, scale 1:250,000.Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000. |
NGMDB product | |
Counties | Blair - Centre - Clinton - Franklin - Fulton - Huntingdon - Juniata - Lycoming - Snyder |