Specimens of desiccated Chenopodium berlandieri ssp. jonesianum from Cloudsplitter and Newt Kash Rock-shelters in Menifee County, eastern Kentucky yielded accelerator dates of 3450 ± 150 B.P. and 3400 ± 150 B.P., respectively, extending the known age of this prehistoric domesticate by 1,000 years.
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Smith et al. (1987) studied this question.
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