Garnet Ratios and Provenance in The Glacial Drift of Western New York

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Science  19 Jun 1964:
Vol. 144, Issue 3625, pp. 1452-1453
DOI: 10.1126/science.144.3625.1452


The ratio of purple to red garnet identifies drift provenance. Low ratios indicate glacier flow from the central Adirondacks. Ratios of 1.4 or greater indicate flow from Canada, by way of the St. Lawrence lowland. The heavy mineral assemblages were evidently undiluted by local sources in western New York.