Entrada Formation

Entrada sandstone

The Entrada Formation in Arches National Park

NPS Photo by Neal Herbert

 

This layer does not occur in Canyonlands, but is dramatically visible throughout Arches National Park.

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

Depositional Environment:
Windblown sand dunes

Appearance:
Red, cross-bedded, arch-forming sandstone

Example:
Monitor and Merrimac buttes along Highway 313 to the Island in the Sky

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