Flake Tools Stratified Below Paleo-Indian Artifacts

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Science  16 Jun 1978:
Vol. 200, Issue 4347, pp. 1272-1275
DOI: 10.1126/science.200.4347.1272


In northwest Missouri, Lithic stage flake tools struck from prepared cores have been excavated underlying a Paleo-Indian fluted point assemblage. These assemblages were in two different loesses of the last glaciation. Thermoluminescent analysis of stone tools dates the Paleo-Indian occupations at 8690 ± 1000 B.C. and 12,855 ± 1500 B.C.; the Lithic stage occupations must be older than 13,000 B.C. on the basis of geologic correlation, lithic analysis, and cultural stratigraphy.