AN  INTEGRATED PETROLEUM  EVALUATION OF NORTHEASTERN  NEVADA


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DEAD HORSE TUFF

Type Section Information

The Dead Horse Tuff is named for Dead Horse Creek in Copper Basin, in T. 45 N., R. 58 E. in the southwestern corner of the Jarbidge Quadrangle (Coats, 1964).

Geologic Age

The Dead Horse Tuff is considered Late Eocene in age with a K-Ar biotite age of 39.9 Ma (Coats, 1974). It is one of the few Eocene ignimbrites in the evaluation area, concentrated in the northern portion of Elko County.

General Lithology

The Dead Horse Tuff is a crystal-vitric and pumiceous gray, white, chocolate brown, or green, quartz latite to biotite rhyolite tuff. Much of the unit is massive devitrified welded tuff. The latitic tuff has phenocrysts of plagioclase, hypersthene and biotite while the rhyolitic members have abundant quartz, sanidine, biotite and plagioclase.

Average Thickness

The Dead Horse Tuff is about 5,200 feet thick along the western flank of the Jarbidge Mountains in the Jarbidge Quadrangle (Coats, 1964).

Areal Distribution

The Dead Horse Tuff is exposed in the Jarbidge Mountains.


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Last modified: 09/12/06