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s <br /> <br />mpany, , <br />ck oi' <br /> <br />GEOLOGY. <br />There is not a ~~pod geologic,~l survey of the District. <br />with a ~ The country rock is Trachyte, Porph,+,~ry, ar!d Rl~yolite, oi' the Ter- <br />tiary age. <br />lope. The <br />es of <br />good <br />