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WEATHER
Kootenai and Morrison Formations and Ellis Group (WYKJk;0)
Geologic Formation
in
WY
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Lithology
Claystone
Limestone
Sandstone
Other
(26 mi²)
Geologic Age
Middle Jurassic – Early Cretaceous (175.1 Ma – 100.5 Ma ago)
Geologic Unit Label
KJk
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.
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Geologic Formation
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