Named for Mulberry Wash, Baboquivari Mountains, AZ. Type section in Fresnal Wash, Baboquivari Mountains, Pima Co, AZ, Basin-and-Range province. Mapped (geologic map) between Mulberry Wash on north and Sycamore Canyon on south, Ts18 and 19S, Rs8 and 9E, where it is in contact with the underlying Chiltepines Member (named) of Pitoikam Formation (named) on east and with overlying Chiuli Shaik Formation (named) on west. Is 3,000 ft thick. Forms 3 units; each unit forms a rugged brown ridge. Lowest unit 1,100 ft thick is mostly pink and gray quartz latite porphyry flows and porphyritic flows; the porphyry contains plagioclase and orthoclase phenocrysts in a fine-grained groundmass. Middle unit is 900 ft thick pink agglomerate or conglomerate of rounded quartz latite porphyry cobbles and boulders in a matrix of quartz latite porphyry fragments. Upper unit is about 1,000 ft thick of pink latite porphyry, red laminated felsite, and flows of red and gray andesite porphyry. Is of Mesozoic? age.

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

Is assigned an Early Jurassic age based on isotopic analysis of zircon.

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