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Northumberland caldera and Northumberland Tuff
Goldfield mining district
Ages of Tertiary volcanic rocks and hydrothermal
adularia argillized rocks ash-flow ash-ﬂow sheet ash-ﬂow tuff Basalt Black Mountain volcanic breccia Brougher Dacite Bull caldera central Nevada Chispa collapse Columbia Mountain Dacite dips east erupted exposed feet ﬁeld ﬁg ﬂows Fraction Tuff geologic map Gold Flat Member Goldfield Goldﬁeld Hills hydrothermally altered intrusive K-Ar ages Kleinhampl Lander County landslide blocks McKee Meda meters miles Milltown Andesite mining district Miocene Mizpah Trachyte Morena Rhyolite Mountain volcanic center Noble Northumberland Northumberland Canyon Northumberland Tuff Nye County Oddie Rhyolite outcrops overlain overlies Paleozoic Peak Pillar Spring porphyritic porphyritic rhyodacite quartz latite quartz monzonite rhyodacite rhyolite road log San Antonio Mountains Sandstorm Formation sedimentary rocks shaft shingle faults Siebert Tuff Silberman silicified siliciﬁed zones silver Spearhead Member Tertiary units Tertiary volcanic Thirsty Canyon Tuff tion Tonopah Tonopah district Toquima Range Trachyte Trail Ridge Member U.S. Geol Vein adularia vein systems volcanic rocks welded tuff western Nevada