Fig. 1. Geologic map of the Balmat area in the Grenville Lowlands of New York, showing locations of the Hermon-type Fowler (FW), Fullerville (FL), and Ore Bed Road (OBR) granites (patterned symbols). The lenticular granites are in the Popple Hill gneiss (dashes) in the limbs of an isoclinal fold, the core of which consists of the Upper Marble unit (lined pattern). A portion of the California granite (v-pattern) occurs at the bottom of the map. Modified after deLorraine et al. (1982) and omitting some other associated rock types. Location of analyzed samples on Table 1 are shown on map by number.