Basalt, tuff, and breccia

Basalt flows, basaltic tuff, tuff breccia, and andesitic rocks in Elko and Humboldt Counties. These rocks correspond to unit Tob on the 1978 State map.
State Nevada
Name Basalt, tuff, and breccia
Geologic age lower Miocene and Oligocene
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia)
Minor
Igneous > Volcanic > Mafic-volcanic > Andesite
References
NGMDB product
Counties Elko - Humboldt