If we do interpret the results of the chemical analyses as indicating a period of increased aridity over conditions as they now exist in the area, one could establish a terminus post quem for the archaeological complexes below approximately 64 inches below baseline. Accordingly, the artifactual materials with Great Basin influences and the earlier Duncan types may date from some time late in the Altithermal. This interpretation would not be completely out of keeping with a dating of the archaeological materials on typological grounds.
Acknowledgments
The author is particularly indebted to Dr. C. J. Rodden for his interest and assistance in the chemical analyses, and to Prof. John P. Miller for his suggestions and helpful criticisms of the preliminary draft of this manuscript.
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