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Deposited Mid- to late-Jurassic (144 to 208 million years ago)
Depositional Environment Shallow marine and mud-flats
Appearance Mix of siltstone, shale and sandstone forms slopes.
Example Some occurrence around the rim of Horseshoe Canyon makes this the youngest layer in Canyonlands. More prevalent along the Green River.
CANCEL
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Last Updated: July 01, 2011 at 09:02 MST