Graduate Thesis Or Dissertation
 

Geology of the Duzel Rock area, Yreka Quadrangle, California

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  • The Duzel Rock area includes four square miles in the eastern Paleozoic subprovince of the Klamath Mountains southeast of Fort Jones, California. The structurally complex terraine is composed of Silurian graywacke, post-Silurian phyllite, limestone and basalt associations, and minor andesitic intrusive rocks. Three groups of sedimentary and extrusive rocks have been recognized; these are the Duzel Rock Group, the Spring Branch Group, and the White's Gulch Limestone. Each of these groups is composed of at least three members. Two limestone members of the Duzel Rock Group may be correlative with the Ordovician Facey Rock Limestone to the south. The White's Gulch Limestone contains a sequence of over 1,000 feet of micrites, oomicrites, oosparites, bedded chert, and green celadonitic sand. This unit is interpreted as a deposit formed in a periodically restricted inter-arc basin, and is tentatively assigned a Lower Paleozoic age. The graywacke, which is a portion of the Moffett Creek Formation, is interpreted as a proximal fan turbidite deposit. Carbonate-cemented breccias mantle limestone outcrops on the east and west flanks of Duzel Rock. These breccias are composed almost entirely of limestone clasts and are believed to be cemented by supersaturated groundwater. All of the members of the Duzel Rock Group are separated from each other by thrust faults, and all three limestone groups have been thrust over the Moffett Creek Formation. A large thrust fault of a magnitude comparable to the pre-Cretaceous regional Mallethead Thrust, separates the Moffett Creek Formation from the Duzel Phyllite. There are numerous high-angle faults in the area postdating the thrusts.
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