Named for exposures in the western part of city of Prescott, Prescott quad, Yavapai Co, AZ, Southwestern Basin-and-Range region. Forms isolated masses in southern and east-central parts of Prescott-Paulden area. No type locality designated. Is a fine- to medium-grained massive slightly altered granodiorite having a poikilitic, hypidiomorphic-granular texture. Is medium, light, or greenish gray. Weathered surface is grayish orange pink to grayish orange. Contains plagioclase, quartz, potassium feldspar, biotite, epidote, and accessory minerals. Most of formation is uniform; some is spotted, layered, or altered. Most of formation has been altered by regional metamorphism. Intrudes Alder Group, the western mass of Government Canyon Granodiorite (new). Is older than Dells Granite (new). Of older Precambrian age. Geologic map.

Source: GNU records (USGS DDS-6; Denver GNULEX).

Assigned to suite two (of 4) in the Prescott area (Yavapai County, Arizona, Southwestern Basin-and-Range region). Suite two, consisting of pre- to syn-tectonic, equigranular, medium-grained hornblende-biotite tonalite and granodiorite plutons, includes the 1,740 +/-15 Ma tonalite of Cherry, 1,750 +/-15 Ma Government Canyon Granodiorite, and Prescott Granodiorite. The plutons are metaluminous, have high magnetite concentrations, and high strontium, and are located both to the northwest and southeast of suite one. Prescott intrudes Government Canyon Granodiorite. Age is refined from Precambrian to Early Proterozoic. Report includes geochemical analyses.

Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).