Abstract

In the Jicarilla Mountains, sheets of Upper Cretaceous Dakota (?) Sandstone have been involved in gliding on an erosional surface. Such structures are restricted to the vicinity of partly eroded domes formed by Tertiary intrusions. The doming created the structural relief necessary for sheets of sandstone to move down a slope under the influence of gravity. Outliers of consolidated gravels, equivalents of the Ogallala Formation in southeastern New Mexico, partly cover the superficial structures and indicate a pre-Pliocene age for the gliding process. The term, superficial structure, or décoiffement, is preferred over collapse structure, currently in use.

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