Fig. 3. Plot of Fe₂O₃ wt. % versus SiO₂ wt. for the Fowler, Fullerville, and Ore Bed Road granites and associated Popple Hill gneisses. Fullerville granite (open triangle); Ore Bed Road granite (open circle); and Fowler granite (open square); data from Carl and deLorraine (1997). Fowler paired biotite gneiss (114; solid diamond) and leucogranite (113; solid square) and coexisting biotite-rich gneiss (98 and 99; solid diamond) and leucogranite (98A; solid square); Fullerville fine-grained granite (118) and megacrystal granite (123; solid triangles), in association with Popple Hill gneiss (121; solid diamond). Least altered Popple Hill gneiss (solid diamond; Table 7 of Engel and Engel, 1958); average of seven Popple Hill gneiss samples (M; solid diamond) and average of four Popple Hill leucosome gneiss samples (L; open diamond; data from Carl, 1988). Numbered data points are from Table 1.