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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 (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.
State |
Wyoming |
Name |
Kootenai and Morrison Formations and Ellis Group |
Geologic age |
Middle Jurassic-Lower Cretaceous |
Lithologic constituents |
Major
Sedimentary > Carbonate > Limestone
Sedimentary > Clastic > Mudstone > Claystone
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Conglomerate
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Mudstone
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References |
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NGMDB product |
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Counties |
Park |