256 GEOLOGICAL EXCURSION TO THE ROCKY MOUNTAINS. 



book wore a compilation of the notes of several individuals, it has been 

 difficult to divide the parts s<> as not to interfere with the continuity 

 of the description. Whatever has been lost in this respect, however 

 has been more than made up by (die greater fullness of treatment. The 



lists, prepared by each contributor, of publications containing the most 

 recent and important geological information in regard to the respective 

 areas described have, for convenience of reference, been combined into 

 a single list placed at the end of the sketch, references being made by 

 means of numbers in the text corresponding to the numbers affixed to 

 each title. 



Some of the visiting geologists have kindly contributed notes and 



sketches made by them during the journey, which form a valuable addi- 

 tion, and it is only to beregretted that they are not more numerous. 



S. F. Emmons, 



Editor. 



