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I GEOLOGY. <br />There is a good geological survey oP the Diatriot. ~ 3 <br />I ,~ <br />.he atructnre and oharacter oY the.oountry rook ie <br />,. ~`Plionoli~e. Po='PhYry!and Trac -''~ ~•,- ~ _ .... .. ,. <br />fie- •,_ <br />.. <br />n. .. .. <br />and <br />1 .. <br /> <br /> <br /> <br /> <br />