Blue Creek Tuff 17. Thick section (~250 m) of uniform dacitic Blue Creek Tuff (unit Tbc), capped by two dacite flows (Lava flows of McClelland Mountain, unit Tmd). View to east of mouth of Blue Creek (Wagon Wheel Gap quad; see Ratte and Steven, 1967, p. H25-H33). Photograph by P.W. Lipman.