LEADER 02592oam 2200589I 450 001 9910703865003321 005 20150901084650.0 035 $a(CKB)5470000002435080 035 $a(OCoLC)910980879 035 $a(EXLCZ)995470000002435080 100 $a20150612d2015 ua 0 101 0 $aeng 135 $aurmn||||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aGray clay (Malpass clay) in the west Eugene Wetlands and the Willamette Valley is weathered and redeposited ash from Mount Mazama /$fauthors: Karin E. Baitis, Gregory J. Retallack, Michael E. James 210 1$aDenver, CO :$cU.S. Department of the Interior, Bureau of Land Management, National Operations Center,$d2015. 215 $a1 online resource (iv, 21 pages) $cillustrations (some color), maps (some color) 225 1 $aTechnical note ;$v447 300 $aTitle from title screen (viewed on July 13, 2015). 300 $a"June 2015"--cover. 300 $a"BLM/OC/ST-15/006+7100"--page [2] of cover. 320 $aIncludes bibliographic references (pages 19-21). 327 $aAbstract--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--References 517 $aGray clay 606 $aVolcanic ash, tuff, etc$zOregon 606 $aClay soils$zOregon 606 $aVolcanic eruptions$zOregon 606 $aVolcanic ash, tuff, etc$2fast 606 $aVolcanic eruptions$2fast 606 $aClay soils$2fast 607 $aOregon$zMount Mazama$2fast 615 0$aVolcanic ash, tuff, etc. 615 0$aClay soils 615 0$aVolcanic eruptions 615 7$aVolcanic ash, tuff, etc. 615 7$aVolcanic eruptions. 615 7$aClay soils. 700 $aBaitis$b Karin E.$01416383 702 $aRetallack$b Greg J$g(Greg John),$f1951- 702 $aJames$b Michael E. 712 02$aUnited States.$bBureau of Land Management, 712 02$aNational Operations Center (U.S.), 801 0$bUDD 801 1$bUDD 801 2$bOCLCO 801 2$bGPO 906 $aBOOK 912 $a9910703865003321 996 $aGray clay (Malpass clay) in the west Eugene Wetlands and the Willamette Valley is weathered and redeposited ash from Mount Mazama$93521535 997 $aUNINA