THE WHEELER GEOLOGICAL SURVEY OF NEW 

 MEXICO FOR 1874. 



primarily topographical and two devoted to geological and biolog- 

 ical investigation. 



Of the former one only, that under charge of Lieut. Blunt, oper- 

 ated east of the Rocky Mountains, while the remaining five sur- 

 veyed from the Colorado line, or near it, southward as far as the 

 Rio El Rito and Canon Apache, in the following order : at the 

 north Lieut. Marshall ; then Wheeler, Whipple, Birnie, and last, 

 Lieut. Price. The last named officer having been incapacitated 

 by sickness was succeeded in charge by Mr. Klett. The two 

 remaining parties were assigned extensive territorial areas, as the 

 nature of their work required widely extended reconnoissances, as 

 well as studies in special localities, the position of which could 

 not be foreseen. Dr. Rothrock was in charge of a party which 

 explored the botany and zoology of southern Arizona and New 

 Mexico, and Dr. Yarrow and Prof. Cope investigated the geology 

 and paleontology of the northern portion of the latter territory. 



We propose to speak of the work of the last named party at 

 present, as several of the others have not yet come in from the 

 field. Dr. Yarrow having left for Washington about the middle 



devolved on the writer. The results obtained have been highly 

 interesting and important to geological science. An analysis of 

 the structure of the region traversed between Pueblo and Santa 

 Fe was accompanied by successful collecting of fossil remains in 

 many of the strata. % Thns the Cretaceous beds near the Huer- 

 fano yielded many fine fossil shells and teeth of extinct fishes, 

 and the carboniferous limestone of the Sangre del Christo pass was 

 found to be equally rich. A unique collection of a large number 

 of most beautifully preserved invertebrate remains was procured 



