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MAP

Topo

Rock Formations

Measure

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Topo

Ecoregions

Public Lands

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BASEMAPS

Default Weather

Temperature

Smoke

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WEATHER

Older andesite and intermediate flows and breccias (NVTa1;0)

Geologic Formation in NV

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Lithology

Andesite

Dacite

Latite

Geologic Age

Middle Eocene – Early Oligocene (47.8 Ma – 28.1 Ma ago)

Geologic Unit Label

Ta1

Unit includes andesite or dacite flows, flow breccias, and hypabyssal rocks in Lander County, andesitic to latitic flows, pyroclastic rocks, and phenoandesitic and phenolatitic flows in Elko County, and other undifferentiated volcanic rocks in other counties. Present in Humboldt, northern Nye, Churchill, Elko, Eureka, Lander, and White Pine Counties. It corresponds to the 1978 State map unit Ta1.

— USGS

Taxonomy

Classified As

Geologic Formation