Rocks in the Wind River area have not been altered significantly by orogenic movement (large structural deformation of the Earth's crust and uppermost mantle due to the interaction between plate tectonics). There are a number of faults, but they show relatively little displacement. The western slope of the Wind River valley is shaped like a fault scarp, and it seems to be aligned with Trout Creek Hill, suggesting a potential fault line there that trends to the northwest. However, the six or seven emplaced lava flow deposits in the area only show small amounts of alteration to the west of the valley, and they show no alteration to the east. Moreover, there are only three significantly altered deposits along the Bear Creek.