N B./p7. pWpghffe],Thesis Advisor

Geologic field mapping, and potassium-argon and rubidium-strontium geochronologic studies in the Avawatz Mountains, southeastern California, indicates that this range is primarily a single large fault block of Mesozoic plutonic rocks, flanked to the southwest and northeast by the Ceonzoic Arrastre Spring and Mule Spring faults, respectively. Several roof pendants of pre-Mesozoic metasedimentary rocks occur within the plutonic complex. Several moderate size and many small pendants of Paleozoic and Pre-cambrian metasedimentary rocks occur within the Mesozoic intrusive complex. Some of the pendants contain sequences of Precambrian metasedimentary rocks that are not easily correlated with any known formations in the area. Two of the largest pendants in the southern half of the range together contain an almost complete stratigraphic sequence extending from the upper part of the upper Precambrian Johnnie Formation to the Upper Devonian Crystal Pas