This outcrop exposes a volcanic tuff . Tuff is the product of deposition of fragments of rock, frothy glass called pumice , and lava thrown from a volcanic vent in an explosive eruption. This explosively-erupted material is collectively called pyroclastics . 12.0 Oxbow in the making on the Wind River. An oxbow lake, or just oxbow, is part of a river channel that has been abandoned.
Oxbows are common along rivers whose channels meander across broad floodplains.
During flood stage, a river may take a more direct path between two adjacent loops, cutting off a loop, which becomes an oxbow lake. Eventually, oxbows become filled in with sediment. The Pinnacles 25.5 Pinnacles 26.7 Forest Service road to Lava Mountain, pictures in Lander. 23.9 Kelly Junction. 37.0 Gros Ventre Slide east of Kelly.