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<br /> <br />GEOLOGY. <br />llir~ and <br />of Colo, ~~; <br />1.OO.c<rf <br />Lorado <br />lliru° arld <br />There is a good geological survey of the District. There <br />are so*•!o se~h7.l~quakir!g'¢spe and snrltce trees o!x the suri'aca. The <br />country' x•ock is -reccia and Phonoli.te, <br /> <br />