Pg. 439 (fig. 2), 440 (fig. 3), 442, 443, 445. Delano Peak latite member of Bullion Canyon volcanics. Brownish red with abundant phenocrysts of oliogoclase, hornblende, and biotite, and minor quartz and magnetite in glassy base with fluidal structure. Forms lenticular mass in Bullion Canyon volcanics. Thickness over 800 feet in center of lens; no separate flows distinguished, although upper part has appearance of flow-breccia. Age is early Tertiary.
Named from occurrence in vicinity of Delano Peak, Marysvale region, southwest-central UT.
[GNC remark (ca. 1960, US geologic names lexicon, USGS Bull. 1200, p. 1078): USGS currently considers the Delano Peak Latite to be Miocene(?) in age. This designation is made on the basis of a restudy of Bullion Canyon Volcanics, now considered to be Miocene(?). See Callaghan and Parker, 1961, Geol. map part of Beaver quadrangle, UT, USGS Min. Inv. Field Studies Map MF-202.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1077-1078).

Identified as a propylitized simple cooling unit of densely welded crystal-rich ash-flow tuff and not as a latite flow. Redescribed--name changed from Delano Peak Latite Member to Delano Peak Tuff Member of Bullion Canyon Volcanics on Wasatch uplift in Piute Co, UT. Fission-track ages on apatite are 23.7 +/-3.6 m.y. and on zircon are 21.8 +/-1.0 m.y., suggesting emplacement about 22 m.y. or in Miocene time. Query removed from age assignment.

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