Archeological Investigations at the Lower Grand Site (39CO14), Corson County, South Dakota. A Report on the 1984 U.S. Army Corps of Engineers Excavations. Volume 1. Main Report.

Abstract : In 1994, the U.S. Army Corps of Engineers contracted with the Archeology Laboratory, Augustana College, Sioux Falls, South Dakota (Contract No. DACW45-94-P-1335), to complete the analyses of recovered materials and a detailed analytical report of the 1984 salvage excavations conducted at the Lower Grand site (39C014) located near Mobridge, South Dakota. In 1984, the U.S. Army Corps of Engineers undertook the excavation of a series of five cache pits exposed through lake bank erosion along the east edge of the site. The current analyses involved a wide range of cultural materials (ceramics, lithics, faunal and floral samples) and included the submission of two charcoal samples for radiocarbon dating. Dates of 510 +/- 80 B.P., and 210 +/- 80 B.P. were obtained. The latter date, combined with the ceramic analyses and seriation accomplished on both the 1984 materials and the larger collections from earlier excavations, indicate the site was occupied from approximately A.D. 1525 to A.D. 1575. A summary of previous work undertaken at the Lower Grand in 1962-1964 and 1969 is also included in this report.