It is our opinion that geologic models like those explaining granulite-facies metamorphism in the Adirondack Highlands, should be based on a variety of data that include results of geochemical study, both petrographic and isotopic work, and detailed examination of field relationships. Recent work in the Adirondacks has concentrated on the former at the expense of the latter. This is in part a natural response to the reality of geological research that allows the rapid generation of large amounts of geochemical data from a few samples. This creates a powerful incentive to sample across wide areas and without tight field control...

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