Third-day road log from Durango, Colorado, to Aztec, Farmington and Shiprock, New Mexico
— Orin J. Anderson, Spencer G. Lucas, Steven C. Semken, William L. Chenoweth, and Bruce A. Black
Summary:
The third-day road log takes us from Durango southward through the eastern San Juan Basin into New Mexico, and then due westward along the San Juan River to just west of Farmington. At Stop 1 we examine volcaniclastic strata assigned to the McDermott Member of the Animas Formation. These strata are of latest Cretaceous (Maastrichtian) age and provide direct evidence of volcanism in the northern part of the Late Cretaceous San Juan Basin. At Stop 2 we examine the San Juan generating station. Stop 3 is in the Hogback monocline that forms the western margin of the San Juan Basin. Here, Cretaceous strata of the Mesaverde Group (locally the Point Lookout, Menefee and Cliff House Formations) can be examined. Stop 4 at Ship Rock is optional. The post-field conference Stop 5 (not described in road log) is a highly unusual stop-a cave home excavated in the Ojo Alamo Formation by New Mexico geologist Bruce Black, just north of Farmington.
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Recommended Citation:
- Anderson, Orin J.; Lucas, Spencer G.; Semken, Steven C.; Chenoweth, William L.; Black, Bruce A., 1997, Third-day road log from Durango, Colorado, to Aztec, Farmington and Shiprock, New Mexico, in: Mesozoic geology and paleontology of the Four Corners Region, Anderson, Orin J.; Kues, Barry S.; Lucas, Spencer G., New Mexico Geological Society, Guidebook, 48th Field Conference, pp. 35-53. https://doi.org/10.56577/FFC-48.35