Unit is named the Granite Pass Granite of the Iron Mountains Intrusive Suite (new) for Granite Pass between the Iron and Granite Mountains in to southeastern part of the Sheep Hole Mountains 30' x 60' quad, San Bernardino Co., CA. Widely exposed in the southern Iron Mountains and northern Granite Mountains as the Granite Pass pluton. Coarse-grained, porphyritic muscovite-biotite monzogranite to granodiorite. Alkali-feldspar phenocrysts 1-4 cm long. Two facies: 1) equigranular facies--medium-grained muscovite-biotite granodiorite, and 2) muscovite-garnet granite facies --muscovite -rich, medium-grained monzogranite to granodiorite; locally garnet-bearing. Intrudes the Danby Lake Granite Gneiss (new). Age is Late Cretaceous.

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