02237oam 2200553 450 991070729740332120160520125728.0(CKB)5470000002462529(OCoLC)891382463(EXLCZ)99547000000246252920140926d1968 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierTertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado nomenclature, lithology, and stratigraphic relations of a sequence of ash-flow tuffs, flows, and breccia /by J.C. Olson, D.C. Hedlund, and W.R. Hansen[Washington, D.C.] :United States Department of the Interior, Geological Survey,1968.Washington :United States Government Printing Office.1 online resource (iv, 29 pages, 1 page of plates) illustrations, maps (some color)Geological Survey bulletin ;1251-CContributions to general geologyTitle from title screen (viewed September 15, 2014).Includes bibliographical references (pages 28-29).Tertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado GeologyColoradoGeology, StratigraphicTertiaryGeologyfastGeology, StratigraphicfastTertiary Geologic PeriodfastColoradofastGeologyGeology, StratigraphicGeology.Geology, Stratigraphic.Tertiary Geologic Period.Olson J. C(Jerry Chipman),1917-2013,1392464Hansen Wallace R.1920-Hedlund David Carl1924-Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910707297403321Tertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado3538592UNINA