Analytical Perspectives on Prehistoric Migration: A Case Study From East-Central Arizona

Abstract

Strontium isotope analysis of the tooth enamel of 69 adults from Grasshopper Pueblo reveals aspects of the settlement of and immigration to the area during the late 13th and 14th centuries. Depending on the range of local strontium isotope compositions, non-local residents vary from one-third to more than half of the individuals analysed. Based on associated archaeological evidence, it is likely that the latter figure is more accurate. The majority of locals are associated with Room Block 2 and the Great Kiva. Individuals associated with Room Blocks 1 and 3 tend to be immigrant, and this is also the case of the two individuals analysed from Room Block 5, a room block which has been thought to represent an immigration to the site. There are both locals and immigrants in the outliers, and the temporal data indicates that immigration continued throughout the occupation of the pueblo. Immigrants originate largely from two geologic areas: those underlain by Precambrian rocks located to the west and south of Grasshopper, or from areas underlain by Phanerozoic sedimentary rocks to the north and immediately east of Grasshopper. Ten individuals buried with diagnostic artefacts were analysed in the sample, and they represent both local and non-local origins, supporting earlier notions that the diagnostic artefacts symbolized sodalities which cross-cut ethnic and social boundaries.