QB PRELIMINARY FIELD REPORT U.^ 



uftftlD STATES GEOLOeiCAL SURVEY 



<L^ /?^ /^i? 



COLORADO AND NEW MEXICO, 



CONDUCTED 



UNDEE THE AUTHOEITY OF HON. J. D. COX, SECRETAEY OF THE INTERIOR 



F. V. HAYDEN 



UNITED STATES GEOLOGIST. 





WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1869. 



