GEOLOGY OF THE YELLOWSTONE NATIONAL PARK, PART II. 



By ARNOLD HAGUE AND OTHERS. 



CHAPTER I. 



DESCRIPTIVE GEOLOGY OF THE GALLATIN MOUNTAINS. 



By Joseph Paxson Lddings and Walter Harvey Weed. 



INTRODUCTION. 



The Gallatin Mountains form a range of peaks and ridges extending 

 southward for 63 miles from the vicinity of Bozeman, on the line of the 

 Northern Pacific Railroad, about latitude 45° 40'. The range lies between 

 the Yellowstone and Gallatin rivers and terminates in the neighborhood of 

 Mount Holmes, at about latitude 44° 45'. The southernmost 18 miles of 

 the range lies within the boundary of the Yellowstone National Park and 

 forms that portion of it described in the present chapter. The northern 

 portion falls within the region described in folios 1 and 24 of the Geologic 

 Atlas of the United States. 1 



Within the Park boundary the peaks of the main chain reach altitudes 

 of from 10,000 to 10,500 feet, and at Electric Peak 11,100 feet, and stretch 

 from Electric Peak, which is situated directly on the northern boundary 

 line, southward to Mount Holmes. The country has been deeply cut by 

 erosion, and is drained by tributaries of the Yellowstone, Gallatin, and 



Geologic Atlas U. S., folio 1, Livingston, Mont., 1893; and folio 24, Three Forks, Mont., 1896. 

 MOK XXXII, PT II 1 1 



