Query: G.N.I.S.

See also: Frisco.

Prospect Mountain Quartzite of Cambrian age is thrust over Paleozoic rocks as young as the Ely Limestone of Pennsylvanian age. The quartzite of the allochthonous plate was believed to be Ordovician-Silurian(?) and had been named Morehouse Quartzite. Overlying rocks are volcanics of Tertiary age. The San Francisco thrust is compared with similar thrusts in the Wah Wah Mountains and the Canyon Range and possibly formed in Late Jurassic(?) and Early Cretaceous (East, Edwin H., 1966. Structure and stratigraphy of San Francisco Mountains, western Utah. AAPG Bulletin; May 1966; v. 50; no. 5; p. 901-920).

Articles that refer to this location:

• Field Notes: June 1st, west from Beaver, UT.;  1 Jun 2005; 
• Utah Highway 21: at Frisco Mine.;  … near Frisco.;  ... west of Milford.; 

View westward of the San Francisco Mountains from near Milford, Utah.	Bee Hive ovens at the Frisco Mine, Utah.	Frisco Mine workings.

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Date and time this article was prepared:5:21:11 PM, 4/24/2026.