Grenadier fault block, Coalbank to Molas Passes, southwest Colorado
D. L. Baars, J. A. Ellingson, R. W. Spoelhof, 1987. "Grenadier fault block, Coalbank to Molas Passes, southwest Colorado", Rocky Mountain Section of the Geological Society of America, Stanley S. Beus
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The Grenadier fault block is a paleotectonic complex exposed in the heart of the San Juan Mountains of southwestern Colorado. Structural and stratigraphic complexities are well exposed by the effects of Pleistocene glaciation and Recent erosion at and above timberline in a rugged alpine setting (Fig. 1). U.S 550 traverses the region between Durango and Silverton, affording excellent access. The most critical exposures lie within T.40N., R.7,8W., near the intersection of 37°45’N. and 107°45’ W. in LaPlata and San Juan Counties. Elevations range between 9,000 and 14,000 ft (3,300-5,133 m), effectively limiting field observations to mid-summer months. The area lies within the San Juan National Forest; access is therefore unrestricted. However, due to the rough terrain, appropriate safety precautions should be observed.
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Rocky Mountain Section of the Geological Society of America
One of six volumes generated by each GSA section for the Decade of North American Geology (DNAG) project, this Centennial Field Guide contains descriptions of 100 sites or site clusters representing outstanding geologic locations in northern Arizona, Colorado, Idaho, Montana, North Dakota, New Mexico, South Dakota, Utah, Wyoming, and Alberta.