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Three AMS radiocarbon assays on separate components of a hunter's tool bag cached at Sand Dune Cave demonstrate that the assemblage dates to cal. A.D. 80–330 (two-sigma range based on the average). These are the first direct dates on Basketmaker II remains from this site. They reveal that the mountain sheep horn flakers included in the cache have a minimal age on the Rainbow Plateau of the late Basketmaker II period. Horn flakers have relevance for examining the role of farmer migration during the Archaic-Formative transition, especially if it can be shown that these tools appeared concurrent with the first cultigens in the region.
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Phil R. Geib (2004) studied this question.
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