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Road log and stop descriptions, Minturn to Leadville, Colorado

By
David W. Beaty
David W. Beaty
Chevron Oil Field Research CompanyP.O. Box 446, La Habra, CA 90633-0446 MS 905, Box. 25046
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Published:
January 01, 1988

Abstract

On the north side of the town of Minturn, the Leadville, Gilman, and Dyer Formations crop out. These rocks are most accessible in two places: in readouts along U.S. Highway 24, and in roadcuts along the railroad (Fig. 2). The northeast wall of the Eagle River canyon at this locality consists of a thick section of sandstones, siltstones, shales, and thin limestones of the Minturn Formation.

The Leadville Limestone/Dolomite consists of two members (Nadeau, 1971; Beaty et al., 1988a: this volume), the Red Cliff Member (below) and the castle Butte Member (above). The Red Cliff Member at Stop 1 consists bedded dolostone, principally of fine and medium grain size (Fig. 2). The dolomitization of these beds is regional in extent, and is interpreted by Horton (1985) to be of early diagenetic, sabkha origin. The Castle Butte Member at Stop 1 is limestone (Fig. 2), which has been described by De Voto (1985, p. 6-156) as “mixed-skeletal grainstones to packstones with readily visible echinoderm, brachiopod and solitary tetracoral fossils and abundant micritized foraminifera, green algae, and ostracods.” This is the southern limit of the limestone facies of the Castle Butte Member in this area.

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Contents

Society of Economic Geologists Guidebook Series

Geology and Mineralization of the Gilman-Leadville Area, Colorado

T. B. Thompson
T. B. Thompson
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David W. Beaty
David W. Beaty
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Society of Economic Geologists
Volume
2
ISBN electronic:
9781934969557
Publication date:
January 01, 1988

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