Third-day road log, from Tucumcari to Conchas Dam, New Mexico
— Spencer G. Lucas, Adrian P. Hunt, Andrew B. Heckert, Barry S. Kues, and Virginia T. McLemore

This trip explores the geology of the Canadian River drainage from Tucumcari north lo Conchas Dam. Here, we contrast differences between the beginning and the end of Late Triassic deposition in the vast Chinle basin, and the continuity of Middle Jurassic eolian deposition across the American Southwest.

At STOP l we examine an unusual lithofacies of the Upper Triassic Redonda Formation. At STOP 2, a roadcut fortuitously created a three-dimensional exposure of the Middle Jurassic Entrada Sandstone, which facilitates discussion of Middle Jurassic wind patterns and paleogeography. STOP 3 ends the fieldtrip at Conchas Dam, where the onset of Chinle Group deposition in the western United States is featured.