Proc. Rocm. Acad. Science. 



MEDINA. 



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CLINTON. 



NIAGARA 



SALINA. 



' CORNIFEROUS. 



HAMI LTON, 



AUEAI. MAP SHOWING Al 



niACRAM OF VERTICA 



(The inclination of strata is greatly c.xaKKtnitcd by the extreme 



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