Abstract
DURING an avocational search for means of identifying the geographical source of artefact obsidian, what appears to be a functional tool has been found. It was postulated that, because the concentration ratio 
in rocks is determined by the origin and age of the rock, it would also be diagnostic of material from a given locality. This communication reports the results of preliminary experiments designed to test the feasibility of the hypothesis.
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References
Heizer, R. F., and Treganza, A. E., Calif. J. Mines Geol., 40, 291 (1944).
Welday, E. E., Baird, A. K., McIntyre, D. B., and Madlem, K. W., Amer. Mineralogist, 49, 889 (1964).
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PARKS, G., TIEH, T. Identifying the Geographical Source of Artefact Obsidian. Nature 211, 289–290 (1966). https://doi.org/10.1038/211289a0
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DOI: https://doi.org/10.1038/211289a0
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