Cenozoic volcanic geology and probable age of inception of basin-range faulting in the southeasternmost Chocolate Mountains, California

Volcanic, Geochemical Survey, Geochronology, Igneous Petrology, Structure, Faulting, Volcanology, Quechan volcanic rocks - Oligocene, [ignimbrite of Ferguson Wash][volcanic rocks of Ferguson Wash] - Oligocene/Miocene, conglomerate of Bear Canyon - Miocene(?), basalt of Black Mountain (CA), [dacite of Picacho Peak (CA)][Picacho dacite] - Miocene,