Rubidium-strontium ages of some basement rocks from Arizona and northwestern Mexico

Mineral District, Geochronology, Granitoid, Metamorphic, Vishnu Schist(Vishnu fm) - [Granite Gorge metamorphic suite][Vishnu group][Vishnu metamorphic complex](Vishnu terrane)(Vishnu series)(Vishnu complex) - Early Proterozoic, [Valentine granite][granite near Valentine](Valentine pluton), Diana Granite - Cerbat complex - Middle Proterozoic, Chloride Granite, [Yavapai Schist][Yavapai Series][Yavapai Group][Yavapai Supergroup], Oracle Granite(Oracle quartz monzonite), (Samaniego granite)[Catalina Granite][Catalina granitic pluton][Catalina quartz monzonite] - Catalina suite - Oligocene, (Catalina gneiss), Wilderness granite - Wilderness suite - Eocene,