Upper San Pedro River near Hereford, AZ – Cochise County | A filled channel cut is exposed in the modern channel wall of the downcutting San Pedro River near Hereford, AZ. Coarser-grained sediment fills a paleochannel cut into finer-grained basin fill deposited before the San Pedro transitioned from a low energy marsh-like environment to arroyo-style downcutting. (Photo by Joe Cook)
Online resources: Cook, J.P., 2017, Site Investigation of Tributary Drainages to the San Pedro River. Arizona Geological Survey Open-File Report 15-02, 83 p. http://repository.azgs.az.gov/uri_gin/azgs/dlio/1724 Pearthree, P.A. and Cook, J.P., Geology and Geomorphology of the San Pedro River, Southeastern Arizona. Arizona Geological Survey Special Paper 10, 24 p. http://repository.azgs.az.gov/uri_gin/azgs/dlio/1633 Cook, J.P and others, 2009, Mapping of Holocene River Alluvium along the San Pedro River, Aravaipa Creek, and Babocomari River, Southeastern Arizona: Arizona Geological Survey Digital Map - River Alluvium Map 01 (DM-RM-01), map scale 1:24,000. http://repository.azgs.az.gov/uri_gin/azgs/dlio/799
