Advance copy. Hinsdale Gneiss. Talc deposit is enclosed by Middle Proterozoic biotite gneiss previously called Hinsdale Biotite Gneiss and Becket Granite Gneiss by Chute (1969, USGS Open-File Report 1217).
Source: Modified from GNU records (USGS DDS-6; Reston GNULEX).
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