San Pedro River | Benson, AZ | A mesquite tree hangs precariously over the void created by collapsing walls of an arroyo leading to the San Pedro River north of Benson, AZ. Freshly collapsed wall sediments are evident in the channel below the tree. (Photo by Joe Cook)
Photographer: Joseph Cook
Photo Date: circa 2007
Photo Location Accuracy: Approximately Located
Photo Tags: erosion, geotourism, San Pedro River, Benson, Holocene