Crystal Peak

At the north end of the Wah Wah Mountains in western Utah. It's composed entirely of the Tunnel Spring Tuff of early Tertiary age. Cavernous weathering is prominent! For scale the larger bushes are full-sized Utah junipers. The rusty outcrops in the right foreground are of the Eureka Quartzite, a much older (Ordovician) unit. The mechanical contrast between the Eureka and the enclosing limestones probably provided a channel for the eruption of the tuff.