Wet Beaver Creek, Yavapai County, AZ | Pothole or scour bend carved into red Permian Supai sandstone by abrasion from swirling basalt clasts within pothole during floods or rapid flow conditions. (Photo by Joe Cook)
AZGS report & geologic map: Mapping of Holocene River Alluvium along Oak Creek, Wet Beaver Creek, West Clear Creek, Fossil Creek, and the East Verde River, Central Arizona - http://repository.azgs.az.gov/uri_gin/azgs/dlio/780