The third unit is called the Silver Star Granodiorite, which is made up of augite diorite and quartz diorite. Dikes with quartz, tourmaline, and sericite occur within the mass, which has a light color aggregated from white to pink plagioclase with orthoclase, clear quartz, and black to green biotite and hornblende crystals. About in length and ranging from in width, it lies along a long axis angled at twenty degrees to the east. It has steep walls which have not been excavated by local canyons that cut into nearby rock. Felts (1939) suggested that the stock intruded at an angle of 20 degrees east of north. The stock cuts through the Eagle Creek formation and the lower two-thirds of the Skamania Andesites, forming metamorphic rock and small dikes of granodiorite and aplite into their tuff and andesite deposits. The absence of dikes or intrusions in the upper third of the Skamania Andesites formation suggests a time gap between the extrusion of the lower and upper segments, during which the granodiorite intrusion occurred. The granodiorite has been altered to create talus, and there are few outcrops, which only occur at stream bottoms and rarely at cliffs that have not been covered with talus. Lava flows, likely produced during the Pleistocene epoch, were deposited in the Lewis River canyon to the west of the Silver Star Mountain and in the Wind River canyon to the east.