The Geology and Mechanics of Formation of the Fort Rock Dome, Yavapai County, Arizona

Author: Fuis, Gary Stephen

Year: 1974

Degree: Dissertation (Ph.D.)

Advisor: Shoemaker, Eugene Merle

Committee Member: Unknown, Unknown

Option: Geology; Geophysics

DOI: 10.7907/8JK8-8S67

Abstract

The Fort Rock dome, in Yavapai County, Arizona, is a recently discovered circular geological structure, two miles in diameter, which initially aroused interest because of its similarity to an impact crater. Features of the dome that are similar to features of an impact crater include a crater-like depression in its center underlain by brecciated Precambrian igneous and metamorphic rocks, upturned Tertiary volcanic and sedimentary rocks on its rim, radial and tangential faults, and an apron of breccia on its flanks showing a crude inversion of the pre-breccia stratigraphy. Studies by the writer have indicated that the structure is primarily a volcanic dome caused by an intrusion at depth. The crater on top is erosional in origin.

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