Yosemite Creek to the west, from which it cascaded down through the steep ravine that is now the route of the Yosemite Falls Trail. The Yosemite Creek watershed, which feeds the creek and Yosemite Falls, contains . It is largely a granite basin that was scraped clean of soil by glaciers. Because of the shallow soil base, the Yosemite Creek watershed has little capacity to hold water, so it quickly drains as the snow melts. Yosemite Creek Yosemite Creek is a creek of the Sierra Nevada, located in Yosemite National Park, Mariposa County, California. The creek's headwaters are at the Grant Lakes
Geology of the Yosemite area the past couple million years was the primary shaping force of the features (such rapid uplift would have greatly accelerated all types of erosion). Geology of the Yosemite area The exposed geology of the Yosemite area includes primarily granitic rocks with some older metamorphic rock. The first rocks were laid down in Precambrian times, when the area around Yosemite National Park was on the edge of a very young North American continent. The sediment that formed the area first settled in the waters of a shallow sea, and compressive forces from a subduction zone in the mid-Paleozoic fused the seabed