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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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