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Grenadier fault block, Coalbank to Molas Passes, southwest Colorado

By
D. L. Baars
D. L. Baars
29056 Histead Drive, Evergreen
,
Colorado 80439
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J. A. Ellingson
J. A. Ellingson
Geology Department, Ft. Lewis College
,
Durango, Colorado 81301
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R. W. Spoelhof
R. W. Spoelhof
Pennzoil Exploration and Production Company
,
P.O. Drawer 1139, Denver, Colorado 80201
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Published:
January 01, 1987

Abstract

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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Contents

DNAG, Centennial Field Guides

Rocky Mountain Section of the Geological Society of America

Stanley S. Beus
Stanley S. Beus
Department of Geology Northern Arizona University Flagstaff, Arizona 86001
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Geological Society of America
Volume
2
ISBN electronic:
9780813754086
Publication date:
January 01, 1987

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