• Spires of Cedar Mesa sandstone in Chesler Park (Needles District)

    Canyonlands

    National Park Utah

Sommerville Formation

Website (nps
Brown, layered cliffs of the Sommerville Formation along the road to Hans Flat
NPS photo by Gary Cox
 

This layer does not occur within Canyonlands, but may be seen at neighboring Glen Canyon National Recreation Area.

Deposited
Mid to late Jurassic (144 to 208 million years ago)

Depositional Environment
Coastal, shallow marine and tidal flats

Appearance
Sandstone, shale, siltstone and gypsum forms slopes and cliffs

Example
Exposed along the Green River and in cliffs above the road to Hans Flat Ranger Station in the Maze

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