Bryant, Bruce Geology, geochronology, geochemistry, and Pb-isotopic compositions of Proterozoic rocks, Poachie region, west-central Arizona: a study of the east boundary of Proterozoic Mojave crustal province - Reston, VA U.S. Geological Survey 2001 - 54 p. ilus. Subjects--Topical Terms: DATACION U-PBGEOCRONOLOGIAGEOQUÍMICAINTRUSIONESISOTOPOS DE PLOMOMETAMORFISMO REGIONALPROTEROZOICO Subjects--Geographic Terms: ARIZONAESTADOS UNIDOS