FIG. 2. Generalized geologic map, showing the northwestern Superior province (SP), northeastern Trans-Hudson orogen (THO) and Churchill province (CH), Phanerozoic cover (PH), Thompson nickel belt (TNB), Fox River belt (FRB), Split Lake block (SLB), and Split Lake fault (SLF) segments of the Superior boundary zone (shaded), Pikwitonei granulite domain (PGD), dikes related to the Molson swarm (Cross Lake, CR; Cuthbert Lake, CT; Nelson River, NR), and the location of U-Pb zircon sampling sites from this study (W106-6) and Heaman et al. (1986; MAN 85-32, 311, 110, 201-6). Geology reproduced in part from figure 1 of Heaman et al., (1986) and the Geological Map of Manitoba (Manitoba Mineral Resources Division, 1979). The inset shows the distribution of Proterozoic supracrustal rocks (black) of the Circum-Superior belt (CS, Cape Smith belt; OI, Ottawa Islands; BI, Belcher Islands; RG; Richmond Gulf; SI, Sutton inlier; NQO, New Quebec orogen, formerly known as Labrador trough, LT; GP, Grenville province) and designations mentioned above.