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Mineral Resources On-Line Spatial Data

Lance Formation, Fox Hills Sandstone, Meeteetse Formation, Bearpaw and Lewis Shales

LANCE FORMATION (Kl north), FOX HILLS SANDSTONE (Kfh), MEETEETSE FORMATION (Km), AND BEARPAW AND LEWIS (Kle) SHALES--In the Bighorn Basin consists of Lance, Meeteetse and, in the southeastern part, tongue of Lewis Shale; in the northern part of the Wind River Basin, of Lance, Meeteetse, and Lewis, and, in the southeastern part of the basin, of Lance and Lewis; on the west side of the Powder River Basin north of T. 45 N., of Lance, Fox Hills, and Bearpaw, and, to the south, of Lance, Fox Hills, and Lewis. LANCE FORMATION--Thick-bedded buff sandstone and drab to green shale; thin conglomerate lenses. FOX HILLS SANDSTONE--Light-colored sandstone and gray sandy shale containing marine fossils. MEETEETSE FORMATION (AGE ABOUT 73 Ma)--Chalky-white to gray sandstone, yellow, green, and dark-gray bentonitic claystone, white tuff, and thin coal beds. BEARPAW SHALE--Dark-greenish-gray shale containing thin gray sandstone partings. LEWIS SHALE (AGE ABOUT 68 Ma)--Gray marine shale containing many gray and brown lenticular concretion-rich sandstone beds.
StateWyoming
NameLance Formation, Fox Hills Sandstone, Meeteetse Formation, Bearpaw and Lewis Shales
Geologic agePhanerozoic | Mesozoic | Cretaceous-Late
Original map labelKlm
Primary rock typemedium-grained mixed clastic
Secondary rock typefine-grained mixed clastic
Other rock typesmixed clastic/volcanic; coal
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Conglomerate
Incidental
Igneous > Volcanic (Pyroclastic, tuff)
Sedimentary > Coal
Sedimentary > Clastic > Mudstone > Claystone > Bentonite
Map references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Unit references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
CountiesFremont - Hot Springs - Johnson - Natrona - Park - Sheridan - Washakie

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