Vol. 6] Merriam: Virgin Valley and Thousand Creek. 



23 



two parts issued separately. The first part includes a general 

 description of the region, a history of investigation carried on 

 there, and a discussion of the geologic history. The second part 

 contains a discussion of the extinct mammalian faunas of these 

 beds, with a consideration of all the accumulated information 

 contributing to an understanding of the age of these faunas 

 and of the formations in which they are found. 



ACKNOWLEDGMENTS. 



In presenting the following report on the work of the 1909 

 expedition in northwestern Nevada, the writer wishes to express 

 his indebtedness to Miss Annie M. Alexander for making the 

 expedition possible through its financial support, and for the 

 personal interest with which the field work was carried on under 

 difficult conditions. The writer is also much indebted to Miss 

 Louise Kellogg, who joined in the field work with Miss Alex- 

 ander and materially contributed to the success of the party. 



During the field operations E. L. Furlong devoted special 

 attention to the occurrence and distribution of the mammalian 

 remains obtained, and to the nature of the mammal beds. Mr. 

 Furlong also had immediate charge of the fossil collections. A. 

 J. Heindl brought together a representative collection of rock 

 specimens illustrating the principal lithological phases of the 

 formations occurring in the region investigated, and made a 

 series of notes on their occurrence and structure. 



In carrying out the work of the expedition the Pacific Live 

 Stock Company, through all of its representatives with whom 

 the members of the party came in contact, most generously 

 assisted in every way possible, and contributed greatly to the 

 efficiency of the expedition. Particularly in connection with the 

 work in the field, mention should be made of assistance by Mr. 

 F. M. Payne, who was very helpful to the party. 



The writer is also indebted to T. H. McGhee and Edward 

 McGhee of Virgin Valley for information regarding the occur- 

 rence of fossil remains. It should be stated that Edward McGhee 

 is, so far as known to the writer, the first person to discover 

 fossil bones in Virgin Valley. On the reconnaissance trip made 



