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<br />GEOLOGY. <br />1n- There+'ia not, a. p;ood f5eolomical aurve~ of the ntatriet, mhe <br />Gap' Fountry ro'Gk'is'Trachyte, Porpk{yr~, RN.olite and Andeaite. <br />h• (leolo~ical''period; tertiary ,age. <br />ad a , <br /> <br />end <br />