Impact of Prehistoric Cooking on Proxy Signatures in Shell Midden Constituents
The analysis of geochemical proxies in skeletal remains has become a standard tool in shell midden research. Sub-seasonally resolved proxy records provide information about environmental and anthropological aspects such as ancient climate conditions, fishing and foraging seasonality or site occupation pattern. However, as subsistence was the primary purpose for fishing activities in most prehistoric cultures, it is likely that many shell midden constituents were subjected to processing methods such as cooking prior to deposition, potentially altering their geochemical proxy records. To study the impact of prehistoric cooking methods on such proxy records, we exposed modern bivalve shells (Mercenaria campechiensis) to different prehistoric cooking treatments. Afterwards, we analyzed shell mineralogy, conventional oxygen and carbon isotopes, various element/Ca ratios and their clumped isotopic composition. Our data clearly show that all prehistoric cooking methods cause an alteration of most paleoenvironmental proxies and in particular the oxygen and clumped isotopic signatures even without a conversion of the initial aragonite into secondary calcite. Thus, depending on the cooking method, pre-depositional heating might have introduced considerable errors into previous paleoclimate studies using shell midden constituents. Furthermore our data show that clumped isotopes can be used to clearly detect and differentiate between different cooking methods.
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Impact of Prehistoric Cooking on Proxy Signatures in Shell Midden Constituents. Peter Müller, Philip Staudigel, Sean Murray, Hildegard Westphal, Peter Swart. Presented at The 81st Annual Meeting of the Society for American Archaeology, Vancouver, British Columbia. 2017 ( tDAR id: 431182)
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min long: -18.809; min lat: -38.823 ; max long: 53.262; max lat: 38.823 ;
Abstract Id(s): 14849