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Dr Alan Channing

Hot spring environments and ecosystems through time
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Hasbrouck Mountain, Tonopah, Nevada

Hasbrouck Mountain lies immediately to the east of U.S. Highway 95, about 5 miles south-southwest of the town of Tonopah, Nevada.

Local Geology
Hasbrouck Mountain is thought to lie along the western edge of a Tertiary volcanic caldera vent. The bulk of the mountain is underlain by ashflow, air-fall and waterlain tuffs and volcaniclastic sediments of the Siebert Formation. The upper portion of the Siebert Formation at Hasbrouck is dominated by epiclastic sediments, mostly volcanic sandstones and conglomerates. Several chalcedonic sinter deposits produced during hot spring activity occur near the summit of the mountain. Hydrothermal breccias are exposed in various areas, especially along the western and northern slopes of the mountain.