EMGIJSEEK DEPAiiTMENT, UNITED STATES AKMY. 



REPOET 



GEOGRAPHICAL AND GEOLOGICAL 



EXPLORATIONS AND SURVEYS 



WEST OF THE ONE HUNDREDTH MER1D[AN, 



li\ CUAUGTS OF 



FJKST LIEUT. GEO. M. WHEELER, 



COUPS OF KNGINEEUS, U. S. ARMY, 

 UXDEl! THIS DinECTION OF 



BEIG. GEN. A. A. HUMPHREYS, 



CHIEF OF KNGINEERS, U. S. AKMV. 



PUBLISHED BY AUTHORITY OF HON. WM. W. BELKNAP, SECRETAllY OE WAR, 



LN' ACCORDANCE WITH ACTS OF CONGRESS OF JUNE iS, 1674, AND FEIlliUAKT 15, 1875. 



IN SIX VOLUMES, ACCOMPANIED BY ONE TOPOGRAPHICAI, ANn ONE ' l-^ [ 



GEOLOGICAL ATLAS. 



PART 1. 



VOL. IV.-PALEONTOLOGY, 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1875. 



