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and dikes of quartz monzonite , correlated with either Elk <br /> Mountain or Lincoln Porphyry occur in the area. <br /> Quaternary Deposits <br /> Quaternary deposits are detrital in nature and con- <br /> tain sand, gravel and boulders. They originated from glacial , <br /> recent alluvial or landslide activity. These are, for the most <br /> part, confined to valley bottoms. <br /> Structural Geology <br /> A large amount of faulting and folding has occurred <br /> in the area. The two major structural features are the Mos- <br /> quito Fault and Kokomo Syncline . <br /> The Mosquito Fault is traceable for many miles. <br /> Major movement along this fault probably occurred between 26 <br /> and 10 million years ago. In this area the fault dips from 45 <br /> to 72 degrees to the west and the west block has moved downward <br /> relative to the east block. <br /> The Kokomo Syncline plunges to the north. Dips of <br /> the sedimentary beds are generally steeper on the east flank of <br /> the syncline than on the west flank. A generalized cross- <br /> section of the syncline is shown in Appendix G. <br /> 4 . 2 GLACIATION AND EROSION AT CLIMAX <br /> Post-ore erosion and glaciation of the Climax deposit <br /> has caused the deposition of high grade molybdenite and associ- <br /> ated minerals in detrital material over a large area to the <br /> north, west and south of Climax. This material adds substan- <br /> tial amounts of molybdenite and associated products to the sur- <br /> face waters in the area. <br /> The ore bodies were emplaced at Climax approximately <br /> 30 million years ago. Reactivated movement- along the Mosquito <br /> Fault took place in the range of 26 to 10 million years ago. <br /> This faulting moved the west block downwards relative to the <br /> east block and left the east block ( containing the majority of <br /> Climax mineralization) as a topographically high area. Erosion <br /> 4-2 <br />