Archaeometric methods such as provenance studies must be predicated on understanding the processes that underlie the production of this information. This study focuses on element-based provenance studies of Mississippian-period pottery, which are complicated by the fact that this pottery generally was tempered with crushed shell in different amounts and of unknown species composition. Experiments conducted at the Missouri University Research Reactor (MURR) have documented elemental dilution and enhancement effects of adding shell temper to clay. Mathematical corrections previously have been employed to correct for shell-temper effects. Results of physical, chemical, and mathematical approaches to eliminating the effects of shell tempering indicate that mathematical methods, based on a firm knowledge of shell composition, provide the most efficient correction.
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Ceramic compositional studies using Instrument Neutron Activation Analysis indicates that it is possible to distinguish between ceramics manufactured from clays originating in the Central Mississippi River valley and clays originating in the Eastern Ozarks. The study also documents that shell-tempered ceramics were being made from Eastern Ozark clays during the period A.D. 700 to A.D. 1000. Shell-tempered ceramics made from clays originating in the Western Lowlands also are found at sites in the Eastern Ozarks during this time period, providing evidence for interaction between the Eastern Ozarks and Central Mississippi River valley.
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