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The distribution of geologic and artifact obsidian from the Silver Lake/Sycan Marsh geochemical source group, South-Central Oregon

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dc.contributor.advisor Roth, Barbara J.
dc.creator Thatcher, Jennifer J.
dc.date.accessioned 2012-08-24T19:43:55Z
dc.date.available 2012-08-24T19:43:55Z
dc.date.copyright 2000-12-08
dc.date.issued 2000-12-08
dc.identifier.uri http://hdl.handle.net/1957/32912
dc.description Graduation date: 2001 en_US
dc.description.abstract Geochemical characterization methods are commonly used in the reconstruction of prehistoric raw material use and procurement systems. Trace element studies of lithic source material and artifacts, specifically those made of obsidian, can reveal important information about the environmental and cultural factors which influence the prehistoric distribution of raw material. The current investigation uses geochemical characterization methods and data to document and evaluate the distribution of geologic and artifact obsidian that originates from the Silver Lake/Sycan Marsh (SL/SM) obsidian source. This large and prehistorically significant source is located in western Lake County, Oregon. Few source descriptions or artifact distribution studies exist for SL/SM obsidian. However, over the past decade, a significant increase in the use of geochemical characterization methods has generated a wealth of data for Oregon obsidian sources. This thesis synthesizes the results of the geochemical characterization analysis of 392 geologic obsidian specimens collected from the SL/SM source area and 1,938 SL/SM obsidian artifacts recovered from over 200 archaeological sites in Oregon, Washington and California. The artifact analytical data were derived from previously characterized artifact collections compiled and archived in an extensive database. A subset of artifacts were characterized for the purpose of this study. Based on the results of geochemical analysis of the geologic material, two distinct source boundaries are defined for the SL/SM geochemical source. The trace element data show that the geologic SL/SM obsidian source material originates from two chemically-related obsidian domes which lie in separate drainage basins. Accordingly, this investigation establishes that the natural distribution of geologic obsidian is highly dependent upon the regional topography. Spatial analyses of the artifact obsidian demonstrate a widespread distribution of SL/SM obsidian throughout central and western Oregon and parts of northwest California and southwest Washington. Numerous cultural and environmental variables appear to have affected the artifact distribution at local and regional levels. The findings show a predominance of SL/SM artifact obsidian use along the western slopes of the Cascade Range within the southern half of Oregon. Locally, use of the source appears to be less pronounced due to the abundance of competing central and eastern Oregon obsidian sources. The results suggest that SL/SM artifact obsidian was distributed both intentionally and incidentally as a result of prehistoric procurement and exchange systems. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Oregon -- Antiquities en_US
dc.subject.lcsh Obsidian -- Oregon en_US
dc.title The distribution of geologic and artifact obsidian from the Silver Lake/Sycan Marsh geochemical source group, South-Central Oregon en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Arts in Interdisciplinary Studies (M.A.I.S.) en_US
dc.degree.level Master's en_US
dc.degree.discipline Interdisciplinary Studies en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Skinner, Craig
dc.contributor.committeemember Wright, Dawn
dc.description.digitization File scanned at 300 ppi (Monochrome, 256 Grayscale, 24-bit Color) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us

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