U.S. GEOLOGICAL SURVEY 



GEOLOGY OF LEADVILLTS, Pi, IV 



FIG.! FACE OP CUFF. ARKANSAS AMPHITHEATRE 



BK 



FIG II BOULDEP BUCKSKIN AMPHITHEATRE. 



Julius Bieii& Co. lith. 



f., Geologtat-in ' 



ARCHAEAN PHENOMENA. 



