Shackley, M. Steven

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UC BerkeleyArchaeological X-ray Fluorescence ReportsTitleAn Energy-Dispersive X-Ray Fluorescence Analysis of Obsidian Artifacts from Two Sites on the Coles Sam Road Project, Naval Weapons Station China Lake, Inyo County, CaliforniaPermalinkhttps://escholarship.org/uc/item/2cv1z6spAuthorShackley, M. StevenPublication Date2014-12-11Supplemental Materialhttps://escholarship.org/uc/item/2cv1z6sp#supplementalCopyright InformationThis work is made available under the terms of a Creative Commons Attribution-NonCommercial License, availalbe at https://creativecommons.org/licenses/by-nc/4.0/eScholarship.org Powered by the California Digital LibraryUniversity of California  GEOARCHAEOLOGICAL X-RAY FLUORESCENCE SPECTROMETRY LABORATORY 8100 Wyoming Blvd., Ste M4-158               Albuquerque, NM 87113 USA   LETTER REPORT  AN ENERGY-DISPERSIVE X-RAY FLUORESCENCE ANALYSIS OF OBSIDIAN ARTIFACTS FROM TWO SITES ON THE COLES SAM ROAD PROJECT, NAVAL WEAPONS STATION CHINA LAKE, INYO COUNTY, CALIFORNIA  11 December 2014  Simone Schinsing Epsilon Systems Solutions 901 Heritage Drive, Ste 204 Ridgecrest, CA 93555  Dear Simone:  I have taken the liberty of sending a letter report in the interest of time.  The mix of sources is similar to the previous projects, with somewhat more obsidian procured from Sugarloaf dome in the Coso Volcanic Field (Table 1, Figure 1; Shackley 2014a, 2014 b).  I refer you to the previous report for more detailed discussion of sources and source assignment (Shackley 2014a; see Tables 1 and 2, and Figure 1 here). Specific instrumental methods can be found at http://www.swxrflab.net/anlysis.htm, and Shackley (2005).  Source assignment was made by comparison to Ericson and Glascock (2004) and Hughes (1988).  Again, since I have no source standard library at this lab, the correlation is a bit variable, but likely the source assignments are accurate.  Analysis of the USGS RGM-1 standard indicates high machine precision for the elements of interest (Table 1 here).       Sincerely,    M. Steven Shackley, Ph.D. Director     VOICE: 510-393-3931 INTERNET: shackley@berkeley.edu http://www.swxrflab.net/ www.escholarship.org/uc/item/2cv1z6sp  2 REFERENCES CITED  Ericson, J.E., and M.D. Glascock   2004  Subsource Characterization: Obsidian Utilization of Subsources of the Coso Volcanic Field,  Coso Junction, California, USA.  Geoarchaeology 19:779-805.  Hughes, R.E.   1988 The Coso Volcanic Field Reexamined: Implications for Obsidian Sourcing and Hydration Dating  Research.  Geoarchaeology 3:253-265.  Shackley, M.S.   2005 Obsidian: Geology and Archaeology in the North American Southwest.  University of Arizona Press, Tucson.  2014a Source Provenance of Obsidian Artifacts from Five Sites on the Naval Weapons Station China Lake, Inyo, Kern, and San Bernardino Counties, California.  Report prepared for Epsilon Systems Solutions, Inc., Ridgecrest, California.  2014b An Energy-Dispersive X-Ray Fluorescence Analysis of Obsidian Artifacts from Nine Sites on the Naval Weapons Station China Lake, Inyo, Kern, And San Bernardino Counties, California.  Report prepared for Epsilon Systems Solutions, Inc., Ridgecrest, California.   Table 1.  Elemental concentrations for the archaeological samples, and USGS RGM-1.   All measurements in parts per million (ppm).  Sample Site Ti Mn Fe Zn Rb Sr Y Zr Nb Pb Th Source 7 INY-9639 466 259 1149579 23413 50 115 44 30 34 Sugarloaf 8 INY-9639 422 298 1174775 25510 51 115 43 35 32 Sugarloaf 9 INY-9639 448 281 1214779 27716 58 142 49 32 37 West Sugarloaf 10A INY-9639 415 317 1241598 28614 48 124 45 34 35 West Cactus Pk 10B INY-9639 657 309 1307111225219 47 157 41 31 37 West Sugarloaf 10C INY-9639 654 285 1261420123018 44 147 41 33 33 West Sugarloaf 4 INY-8300 346 272 1135768 24512 49 110 47 30 35 Sugarloaf 5A INY-8300 486 281 1167816624612 49 105 46 28 36 Sugarloaf 5B INY-8300 565 328 1221513727213 54 115 45 39 43 Sugarloaf 6 INY-8300 406 307 1179394 25112 50 113 43 34 33 Sugarloaf 15 INY-8300 431 277 1122161 23512 49 109 42 29 27 Sugarloaf 14A INY-8300 391 298 1176264 26414 52 119 49 32 28 Sugarloaf 14B INY-8300 404 276 1134455 2429 47 116 42 30 33 Sugarloaf 16A INY-8300 682 305 1330911724519 51 165 39 31 35 West Sugarloaf 16B INY- 397 26 1145 70 23 11 50 107 36 32 28 Sugarloaf www.escholarship.org/uc/item/2cv1z6sp  38300 8 4 816C INY-8300 532 307 1189110725913 51 112 45 29 36 Sugarloaf RGM1-S4  1515 290 1369139 14910523 217 8 17 11 standard  www.escholarship.org/uc/item/2cv1z6sp        Figure 1.  Rb versus Zr bivariate plot of archaeological samples (after Hughes 1988).    4www.escholarship.org/uc/item/2cv1z6sp 

An Energy-Dispersive X-Ray Fluorescence Analysis of Obsidian Artifacts from Two Sites on the Coles Sam Road Project, Naval Weapons Station China Lake, Inyo County, California

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An Energy-Dispersive X-Ray Fluorescence Analysis of Obsidian Artifacts from Two Sites on the Coles Sam Road Project, Naval Weapons Station China Lake, Inyo County, California

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