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.

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

Depositional Environment
Coastal, shallow marine and tidal flats

Sandstone, shale, siltstone and gypsum forms slopes and cliffs

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

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