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Mineral Resources On-Line Spatial Data

Kootenai and Morrison Formations and Ellis Group

KOOTENAI AND MORRISON FORMATIONS AND ELLIS GROUP. KOOTENAI FORMATION--Rusty thin-bedded sandstone, grayish-red soft claystone, white limestone, and chert-pebble conglomerate. MORRISON FORMATION in northern Yellowstone area--Variegated silty claystone and fine-grained sandstone. ELLIS GROUP includes SWIFT, RIERDON, and SAWTOOTH FORMATIONS. Swift Formation--Calcareous glauconitic sandstone and sandy limestone. Rierdon Formation--Mudstone, siltstone, shale, and basal limestone. Sawtooth Formation--Red beds and limestone.
StateWyoming
NameKootenai and Morrison Formations and Ellis Group
Geologic agePhanerozoic | Mesozoic | Jurassic-Middle Jurassic-Late(?) Cretaceous-Early
Original map labelKJk
Primary rock typefine-grained mixed clastic
Secondary rock typemedium-grained mixed clastic
Other rock typeslimestone; conglomerate
Lithologic constituents
Minor
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Mudstone
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Carbonate > Limestone
Sedimentary > Clastic > Conglomerate
Sedimentary > Clastic > Mudstone > Claystone
Sedimentary > Clastic > Sandstone
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 coveragePark

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