期刊
JOURNAL OF ARCHAEOLOGICAL SCIENCE
卷 39, 期 3, 页码 663-671出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jas.2011.10.029
关键词
Chemostratigraphy; Lithostratigraphy; Cooper's Ferry site; Idaho; Contextual association; Provenience; X-ray fluorescence; Multiple discriminant function analysis; Stratigraphic correlation
资金
- Keystone Archaeological Research Fund
- Bernice Peltier Huber Charitable Trust
- Bureau of Land Management's Cottonwood Field Office
- Oregon State University's Department of Anthropology
- BLM District Archeologist
- Nez Perce Indian Tribe
Correlating archaeological finds with their associated stratigraphic context is elementary to modern excavation methods. Although micro-contextual approaches can provide invaluable perspectives, ascribing primary depositional status and associative context has traditionally been a qualitative exercise. To improve the empirical nature of this process as part of new excavations at the Cooper's Ferry site in western Idaho, we established a chemostratigraphic framework that enables us to quantitatively relate the elemental geochemistry of sediments associated with artifacts and other samples back to a master lithostratigraphic sequence. We subjected a total of 151 PXRF readings from six lithostratigraphic units to multiple discriminant function analysis, which led to the identification of characteristic elements. To test the site's chemostratigraphic framework, we collected PXRF readings from an infilled rodent burrow, which visually appeared to contain mixed sediments from multiple lithostratigraphic units. Statistical analysis could not relate the rodent burrow's sedimentary geochemistry well to any of the known lithostratigraphic units, thus marking it as potentially disturbed. This methodological approach allows us to make quantitative correlations between stratigraphic units across the site and most importantly, enables us to independently evaluate whether objects from any part of the site are in direct association with anomalous or regular sediments. (C) 2011 Elsevier Ltd. All rights reserved,
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