STABLE ISOTOPE ANALYSIS AND DIET IN EASTERN OKLAHOMA

Abstract

Over the last three decades, significant quantitative information on prehistoric diets has come to light from a variety of locations in the Caddoan archaeological area, a region encompassing eastern Oklahoma, western Arkansas, northeast Texas, and northwest Louisiana. Most of this research is based on macro-botanical and faunal remains analysis. As an additional line of evidence for the growing body of botanical and faunal data, stable carbon and nitrogen isotopes in bone collagen were analyzed from 82 human and faunal samples from the Arkansas basin and Ozark Highlands in eastern Oklahoma. The research investigates the role of maize in diets through time and across sex and status dimensions. Spanning six phases, within the time range 300 B.C. to A.D. 1650, mean δ¹³C values increase from –19.2 to –12.7 parts per million ‰. Although present prior to A.D. 1000 substantial increases in the use of maize do not begin until the Harlan phase (A.D. 1050–1250). Even with increased use, maize never dominates the diet to the extent seen in Mississippian period sites farther east.