A good example can be seen at the Dillion Pinnacles in Curecanti National Recreation Area. The resistant welded tuff that caps Dillon Mesa is on top, overlying the West Elk Breccia, which has eroded into the pinnacles. Exposed under the breccia are the older, underlying Mesozoic sedimentary rocks including the Mancos, Dakota, and Morrison Formations.
A similar example can be found at Dillon Pinnacles within Curecanti National Recreation Area. The resistant welded tuff that forms the top of Dillon Mesa is situated atop the West Elk Breccia, which has eroded into the pinnacles. Beneath the breccia, older Mesozoic sedimentary rocks are exposed, including the Mancos, Dakota, and Morrison Formations.