Alabama Hills Granite. Very pale orange to pinkish gray, hypidiomorphic seriate to faintly porphyritic, medium-grained biotite monzogranite. Underlies an area of about 35 sq km in the Alabama Hills, Inyo County, central eastern California. In places, includes fine-grained hypabyssal(?) facies. Locally contains pale-pink phenocrysts of potassium feldspar as large as 1 cm, abundant aplite, and rare pegmatite dikes. Includes small pendant of Paleozoic(?) calcitic marble and calc-hornfels in NE/4 sec. 13, T. 15 S., R. 35 E. Intrudes upper part of informal volcanic complex of Alabama Hills (Middle Jurassic). Is broadly coeval with granodioritic plutons of Mount Whitney Intrusive Suite in Sierra Nevada; this pluton is distinctly less mafic and is interpreted to represent a separate intrusive mass. Age is Late Cretaceous. Biotite K-Ar age of ~82 Ma (Evernden and Kistler, 1970, USGS Prof. Paper 623); preferred U-Pb age of ~85 Ma (Chen and Moore, 1982, Geology, v. 7).
Type locality: a few mi west of Lone Pine, on the north side of Whitney Portal Road 400 m east of the junction with Movie Road, in S/2 sec. 30, T. 15 S., R. 36 E., [approx. Lat. 36 deg. 35 min. 42 sec. N., Long. 118 deg. 06 min. 15 sec. W.], Lone Pine 15-min quadrangle, Alabama Hills Recreation Area, Inyo Co., central eastern CA. [Named from Alabama Hills, Inyo Co., central eastern CA].
[Additional locality information from USGS historical topographic map collection TopoView, accessed February 1, 2023.]

Source: Publication.