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UNITED STATES GEOLOGICAL EXPLORATIOiN OF THE FORTIETH PARALLEL. 



CLARENCE KING, GEOI,CGIST-IN-CHARGE. 



DESCRIPTIVE GEOLOGY. 



BY 



ARNOLD HAGUE AND S. F. EMMONS. 



SUBMITTED TO THE CHIEF OF ENGINEEES AND PUBLISHED BY OBDEE OF THE SECBETAEY OF 



WAR UNDER AUTHORITY OF CONGRESS. 



ILLTTSTKATED BY XXVI PLATES. 





294586 



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WASHINGTON: 

 GOVERNMENT PRINTING OFFICE. 



1877. 



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