Sediments, geomorphology, magnetostratigraphy, and vertebrate paleontology in the San Pedro Valley, Arizona

Stratigraphy, Geomorphology, Paleomagnetism, Correlation, Fluvial Sedimentary, Lacustrine Sedimentary, Biostratigraphy, Vertebrate, Sedimentary Petrology, Tectonics, Areal, Paleoclimatology, Paleosol, St. David fm(fm of St. David area) - Pliocene/Pleistocene - Gila assemblage, [Huckleberry Ridge ash bed][Huckleberry Ridge tephra], Post Ranch ash bed,