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Mineral Resources On-Line Spatial Data

Thermopolis shale

Thermopolis shale: dark-gray shale with some sandstone. The subsurface consists of Muddy sandstone member or Newcastle sandstone member at top, Skull Creek shale member in middle, and Fall River sandstone or First Cat Creek sand of drillers at base.
StateMontana
NameThermopolis shale
Geologic agePhanerozoic | Mesozoic | Cretaceous-Early
Original map labelKt
CommentsMany areas on the map shown as Kc include rocks that are mapped separately on more modern maps as Thermopolis Shale.
Primary rock typemudstone
Secondary rock typesandstone
Other rock typesbentonite
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Incidental
Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed)
Map references
Ross, P.R., Andrews, D.A., and Witkind, I.J., 1955, Geologic map of Montana: U.S. Geological Survey, 2 sheets, scale 1:500,000.
Unit references
Roberts, A.E., 1972, Cretaceous and early Tertiary depositional and tectonic history of the Livingston area, southwestern Montana, in Geology of the Livingston area, southwestern Montana: U.S. Geological Survey Professional Paper 526-C, p. C1
O'Neill, J.M., Christiansen, R.L., 2002, Geologic map of the Hebgen Lake quadrangle: Montana Bureau of Mines and Geology Open File Report 464, 21 p, scale 1:100,000.
Tysdal, R.G., Ludington, Steve, and McCafferty, A.E., 1996, Mineral and energy resource assessment of the Helena National Forest, west-central Montana: U.S. Geological Survey Open-File Report 96-683-A, 322 p., 6 plates.
Lopez, D.A., 2000, Geologic map of the Billings 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 59, scale 1:100,000.
Fraser, G.D., Waldrop, H.A. and Hyden, H.J., 1969, Geology of the Gardiner area, Park County, Montana: U.S. Geological Survey Bulletin 1277, 118 p.
Tysdal, R.G., Dyman, T.S. and Nichols, D.J., 1989, Correlation chart of Lower Cretaceous rocks, Madison Range to Lima Peaks area, southwestern Montana: U.S. Geological Survey Miscellaneous Field Studies Map MF-2067, 15 p., 1 sheet.
Lopez, D.A., 2000, Geologic map of the Bridger 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 58, scale 1:100,000.
Tysdal, R.G., Dyman, T.S. and Nichols, D.J., 1989, Lower Cretaceous bentonitic strata in southwestern Montana assigned to Vaughn Member of Mowry Shale (east) and of Blackleaf Formation (west): The Mountain Geologist, v. 26, no. 2, p. 53-61.
Knechtel, M.M., 1959, Stratigraphy of the Little Rocky Mountains and encircling foothills, Montana, in Contributions to economic geology: U.S. Geological Survey Bulletin 1072-N, p. N723-N752.
Geographic coverageBig Horn - Carbon - Yellowstone

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