First, you created a decent page, I'm glad it's here. However, I have two corrections. First, those layers you referred to , most of them limestone, mean they were deposited over the eons layer by layer mostly as sediment on the floor of an ancient sea. It's obvious that the East face most clearly displays those layers as this is a >Fault block< mountain, similar to most Great Basin ranges, which has been uplifted on the East side and tilted at about a 40 degree angle from horizontal. The West face consists of the topmost 2 or 3 layers. In fact, the most direct route to the summit climbs on top of the uppermost limestone layer only. As opposed to SE side routes, which would cross multiple layers of rock. Volcano Peak to the SW is a volcanic plug remnant, Rishel Peak is not.
Second, I appreciate the leave no trace ethic. I'm glad you mentioned it. I didn't find any manmade detritis on the mountain itself which was encouraging. However, neither Rishel Peak or the surrounding area is a Wilderness Area.