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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.
|Name||Lance Formation, Fox Hills Sandstone, Meeteetse Formation, Bearpaw and Lewis Shales|
|Geologic age||Phanerozoic | Mesozoic | Cretaceous-Late|
|Original map label||Klm|
|Primary rock type||medium-grained mixed clastic|
|Secondary rock type||fine-grained mixed clastic|
|Other rock types||mixed clastic/volcanic; coal|
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Conglomerate
Sedimentary > Clastic > Mudstone > Claystone > Bentonite
Sedimentary > Coal
Igneous > Volcanic (Pyroclastic, tuff)
|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.
|Geographic coverage||Fremont - Hot Springs - Johnson - Natrona - Park - Sheridan - Washakie|
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