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Younger rhyolitic flows and shallow intrusive rocks (NVTr3;0)

Geologic Formation in NV, CA, OR, ID, UT

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Lithology

Rhyolite

Latite

Dacite

Geologic Age

Miocene (23.03 Ma – 5.33 Ma ago)

Geologic Unit Label

Tr3

Rhyolitic flows, domes, plugs, breccias, quartz latite, rhyodacite, quartz porphyry dikes, and other shallow intrusive rocks. This unit includes rocks mapped as the Cañon Rhyolite on the Washoe North map, the Jarbidge Rhyolite and phenorhyolitic and phenodacitic flows and domes on the Elko County map, and other unnamed units. It has a distribution similar to Tt3, with exposures in the northern and southern parts of the State, but only crops out in a few places in the central region. It corresponds to unit Tr3 on the 1978 State map, and also includes a few rocks mapped as Trt on the 1978 State map. This unit is exposed in every county except White Pine.

— USGS