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4. GEOLOGY, GLACIATION AND EROSION AT CLIMAX <br /> 4. 1 GENERAL GEOLOGY <br /> The generalized geology in the area of Climax is shown <br /> in Appendix G. This geology map was compiled from maps by Vaughn <br /> Surface, 1971 and Ogden Tweto, 1974 . <br /> Because of the diversity of rock types , ages of rock <br /> units, and abundant faulting and folding,, the area is geologically <br /> complex. <br /> Precambrian Rocks <br /> Precambrian units consist of crystalline metamorphic <br /> rocks, correlated with the Idaho Springs Formation and Silver_ <br /> Plume Granite. Metamorphic rocks are thought to be of metasedi- <br /> mentary origin and are divided into granulite, gneissic and <br /> miqmatite units. The Silver Plume Granite is present in three <br /> texturally varieties, all of which are of similar composition <br /> (quartz monzonite to granite) . The three varieties include a <br /> trarhitoid phase, a fine to medium grained equigranular phase and <br /> a pegmati_ti_c phase. The granite occurs as stocks , dikes and <br /> sills intruding the Idaho Springs Formation. <br /> Paleozoic Rocks <br /> The thick sedimentary rock sequence in the area is <br /> Paleozoic in age. A general stratigraphic sequence for these <br /> sediments is given in Table 4 . 1. <br /> 4-1 <br />