Field of Science

The Owl Rock Member of the Chinle Formation in the Chinle Valley

The Owl Rock Member of the Chinle Formation is widely exposed in the Four Corners area of the western United States.  The unit is characterized by its variegated color scheme and prominent carbonate lenses. In the Chinle Valley the Owl Rock overlies the Petrified Forest Member and is overlain by the Rock Point Member.

Owl Rock Member (top) and the Petrified Forest Member (bottom) at Round Top Ridge.
Prominent carbonate lenses in the Owl Rock Member at Round Top Ridge.

Thick beds of carbonate in the very top of the Owl Rock Member at Round Rock.

Close-up of fallen blocks of the upper carbonate beds at Round Rock.

Contact between the top of the Owl Rock Member and the overlying Rock Point Member at Round Rock.

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