The pre-Cambrian of the west central part of the Wind River Range consists essentially of medium-grained and porphyroblastic, granitic rocks, faintly gneissose, but with no regionally constant strike. Patches of migmatite gneiss and agmatite occur throughout and seem to prevail in the peaks along the Continental Divide. One, possibly two, generations of older basic intrusions, mostly irregular dikes, have been partly granitized. Scattered late pre-Cambrian dikes are unmetamorphosed.
Petrologic reconnaissance in the pre-cambrian of the western part of the wind river mountains, Wyoming.