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Series <br />Formation <br />Description <br />Tpg -5 (Dillon Mesa <br />Gilpin <br />Tuff ) 2 <br />Peak <br />Tpg -4 10 m (32 ft) <br />Tuff <br />(Tpg) <br />Tpg -3 (Blue Mesa <br />. <br />Tuff) 10Q m:(325 ft) <br />Predominantly quartz - <br />(4 mbrs.) <br />latitic, welded, <br />Tpg -1 (Ute Ridge <br />Tuff) 150 m (494 ft) <br />ash -flow tuffs <br />Dark, massive flows, flow breccias, <br />Burns <br />and tuffs of predominantly <br />Formation <br />rhyodacitic composition <br />0 to 70 m (230 ft) thick <br />Oligocene <br />Medium to dark, rhyodacitic to <br />Eureka <br />quartz - latitic, welded, ash -flow <br />'Tuff <br />tuff with abundant lithic <br />inclusions <br />0 to 60 m (200 ft) thick <br />Dark, porphyritic and amygdular <br />Picayune <br />flows, breccias, and tuffs of <br />Formation <br />andesitic to rhyodacitic <br />composition <br />15 to 30 m (50 to 100 ft) thick <br />Primarily andesite to rhyodacite <br />San Juan <br />mudflow breccias with sparse, <br />Formation <br />interbedded andesite flows <br />600 to 800 m (2,000 to 2,600 ft) <br />thick <br />Telluride <br />Reddish -gray to red brown conglom- <br />Conglomerate <br />erate with interbedded sandstone, <br />Eocene <br />siltstone, and shale <br />0 to 160 m (520 ft) thick <br />Figure 7. Tertiary stratigraphic section in the <br />vicinity of the Revenue - Virginius mine (after <br />Burbank and Luedke, 1966; Lipman and others, <br />1973). <br />Revenue Mine January 2015 TR 05 i -10 <br />