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Rhyolite and dacite domes and flows and small hypabyssal intrusive bodies (ORTr;0)
Geologic Formation
in
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Lithology
Dacite
Rhyolite
Dacite
Other
(136 mi²)
Geologic Age
Late Eocene – Miocene (37.8 Ma – 5.33 Ma ago)
Geologic Unit Label
Tr
Mostly light-gray to red, dense, flow-banded, nonporphyritic and porphyritic rhyolite and dacite in nested domes, small intrusive bodies, and related flows. Includes some near-vent breccias, pumice-lapilli tuffs, and coarse pumicites. Commonly associated with mercury mineralization. Includes several small hypabyssal intrusions of diorite, granodiorite, and quartz monzonite exposed in Paisley Hills of Lake County (Muntzert, 1969; Muntzert and Field, 1968). In many places represents vents for lava flows and tuff of unit Tsf
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USGS
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Geologic Formation
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