02592oam 2200589I 450 991070386500332120150901084650.0(CKB)5470000002435080(OCoLC)910980879(EXLCZ)99547000000243508020150612d2015 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierGray clay (Malpass clay) in the west Eugene Wetlands and the Willamette Valley is weathered and redeposited ash from Mount Mazama /authors: Karin E. Baitis, Gregory J. Retallack, Michael E. JamesDenver, CO :U.S. Department of the Interior, Bureau of Land Management, National Operations Center,2015.1 online resource (iv, 21 pages) illustrations (some color), maps (some color)Technical note ;447Title from title screen (viewed on July 13, 2015)."June 2015"--cover."BLM/OC/ST-15/006+7100"--page [2] of cover.Includes bibliographic references (pages 19-21).Abstract--Introduction--Geologic setting of Malpass clay and Dayton soil--Material and methods--Stratigraphic position of the gray clay in the west Eugene wetlands--Chromatography--Vertic soil and gilgai relief--X-ray diffraction--Transmission electron microscope EDX analyses--Transmission electron microscope images--Mineralogy of gray clay unit--Radiometric ages--Palynology--Conclusions--ReferencesGray clay Volcanic ash, tuff, etcOregonClay soilsOregonVolcanic eruptionsOregonVolcanic ash, tuff, etcfastVolcanic eruptionsfastClay soilsfastOregonMount MazamafastVolcanic ash, tuff, etc.Clay soilsVolcanic eruptionsVolcanic ash, tuff, etc.Volcanic eruptions.Clay soils.Baitis Karin E.1416383Retallack Greg J(Greg John),1951-James Michael E.United States.Bureau of Land Management,National Operations Center (U.S.),UDDUDDOCLCOGPOBOOK9910703865003321Gray clay (Malpass clay) in the west Eugene Wetlands and the Willamette Valley is weathered and redeposited ash from Mount Mazama3521535UNINA