Striped Rock granite, in Grayson Co., southwestern VA, forms an elliptical area 8 mi long by 3 mi wide on southeast side of Point Lookout and Buck Mountains. Main area extends from near Pilgrims Rest Church southwestward to Saddle Creek. Its greatest width is northwest of Independence. Unit is composed predominantly of biotite granite, fine-grained aplite, and pegmatite. It contains garnet in places and at Peach Bottom Church, contains xenolithic inclusions. A syenite facies forms a narrow body within the southern part of the main granite area where it parallels the strike of the main granitic mass. Syenite is bordered in places by narrow bands of Saddle gneiss, which separate the syenite from the Striped Rock granite. There are small inclusions of Saddle gneiss and Cattron diorite in the Striped Rock. Bordered on the northern and northeastern sides and intruded by Carsonville granite. Age is Precambrian. [Name was introduced in an abstract by A.J. Stose in 1942 (American Geophysical Union Transactions, 23rd Ann. Mtg, pt. 2, p. 342).]

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

Mapped as informal unit in Grayson Co. Described as faintly foliated to mylonitic, fine- to medium-grained equigranular, fluorite-, epidote-, and allanite-bearing hornblende-biotite granite and granite gneiss. [Virginia Blue Ridge Complex not used.]

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

Striped Rock Granite has Rb-Sr whole-rock isochron age of 681+/-5 Ma (Espenshade and others, 1975), and U-Pb zircon age of 695 Ma (Odom and Fullagar, 1984).

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