20 SMITHSONIAN INSTITUTION 



a scale map on which all of the more important finds will be accu- 

 rately located. This mapping, combined with the several geological 

 sections measured by him, insures the accurate placement both geo- 

 logically and geographically of the specimens collected. This phase 

 of the work should be of the utmost importance in making this a basic 

 collection for the more exact determination of the faunal zones as 

 well as assisting in a more precise correlation of the horizons with 

 those of the other Tertiary basins of the Rocky Mountain region. So 

 far as I am aware never before in the work on the Bridger formation 

 has a paleontologist had the cooperation of a trained geologist in these 

 determinations, and it is felt that the final results will prove of great 

 importance. 



