Canyonlands National Park Morrison Formation

The Morrison Formation is composed of three members (listed from youngest to oldest): Brushy Basin, Salt Wash and Tidwell. Each has different characteristics due to changes in the depositional environment. This layer does not occur in Canyonlands.


Late Jurassic (144 to 208 million years ago)

Depositional Environment

Varied between river, tidal flat and shallow marine


Brushy Basin: multicolored Bentonite clays (volcanic ash)

Salt Wash: Light-colored, ledge-forming sandstone.

Tidwell: red marine sandstones frequently containing chert.


The Salt Wash Member is a source of Uranium which was mined throughout the Moab area. Dinosaur tracks and fossils also appear in the Morrison Formation.


Visible in the northern parts of Arches (Salt Valley) and along Highway 191 north of Moab.

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Currently Viewing Canyonlands National Park Morrison Formation
November's Featured Park
The North Cascades have long been known as the North American Alps. Characterized by rugged beauty, this steep mountain range is filled with jagged peaks, deep valleys, cascading waterfalls and glaciers. North Cascades National Park Service Complex contains the heart of this mountainous region in three park units which are all managed as one and include North Cascades National Park, Ross Lake and Lake Chelan National Recreation Areas.
November's Animal
Badgers are animals of open country. Their oval burrows (ten inches across and four to six inches high) are familiar features of grasslands on sandy or loamy soils of the eastern plains or shrub country in mountain parks or western valleys.
Currently Viewing Canyonlands National Park Morrison Formation