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The Lamoille Canyon fold nappe has an overturned limb 5–10 km long in the direction of east-southeastward vergence. The nappe plunges gently north-northeastward, and hinge lines can be traced for 20 km through this and adjacent quadrangles (Howard, 1980; Howard and others, 1979). Parasitic folds and mineral lineations parallel the north-northeastward-trending nappe throughout the sillimanite zone. Development of these fabrics evidently spanned a long sequence of intrusions. Many individual bodies of the pegmatitic granite are mesoscopically folded parallel to the nappe, yet other bodies, or even parts of the same bodies, locally cut across the mesoscopic folds. Also, the pegmatitic granite is more abundant on the nappe’s inverted lower limb and so does not evidence gross folding around the nappe. These relations suggest that nappe folding mostly predated but overlapped in age with Late Cretaceous pegmatitic granite intrusion. Locally, Paleogene intrusions exhibit lineation of the same nappe-parallel north northeastward strike, for instance in the granite gneiss of Thorpe Creek 3.5 km north of the southeast corner of the quadrangle. This suggests that flow in the infrastructure, geometrically related to the nappe, continued through Paleogene time (MacCready and others, 1997).
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