450 



REPORT OF NATIONAL MUSEUM, 1904. 



The published results of these explorations, geological and other- 

 wise, form the thirteen quarto volumes of Pacific Railroad Reports, 

 so well known to all naturalists. Among those who accompanied the 

 expeditions and whose reports gave almost the first authoritative and 

 systematic accounts of the geology of the regions passed over were 

 Jules Marcou, whose geological map has been mentioned; W. P. Blake, 

 of New Haven, Connecticut; Thomas Antisell, James Schiel. and J. S. 

 Newberry. 



Fig. 59.— Map showing principal routes of exploring parties in connection with Pacific Railroad 



surveys. 



Marcou received his appointment in May, 1853, with orders to join 

 Lieut. A. W. Whipple in the exploration of a route near the thirty- 

 fifth parallel of latitude. The route followed lay by way of Fort 

 Smith, Arkansas; westward through Albuquerque and Santa Fe, New 

 Mexico, to Los Angeles, California, and occupied the period between 



