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Cl Introduction._  2 Pre-Tertiary rocks. 4 Older volcanic rocks of Tertiary age. 4 Ash-flow formations^ 8 Blue Mesa Tuff 14 Dillon Mesa Tuff 17 Sapinero Mesa Tuff.. 19 Fish Canyon Tuff 20 Carpenter Ridge Tuff 23 Hinsdale Formation. 26 References cited. 28

Tertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado