2VG ANNUAL KECORD OF SCIENCE AND INDUSTRY. 



sas, Grand, and Platte Rivers together with several of 

 their large tributaries, have their origin. The principal 

 branches are the Blue, Snake, Williamson, and Frazer Rivers 

 on the west slope, and Tarryall, Fountain of the Bouillie, 

 Bear, Clear, St. Vrain, Boulder, Thompson, and Buckhorn 

 Rivers on the eastern slope. 



The main Rocky Range and its minor ranges are in this 

 district peculiarly complicated, for the latter, at times, on 

 account of their height and magnitude, seem to lose their 

 subordinate character and become independent ranges, while 

 the main range contains groups or clusters of peaks so com- 

 plicated in their form and connection that it requires close 

 observation on the part of the topographer to lay down the 

 true drainage. 



Among the minor ranges, the Park, Williams or Blue 

 River, Gore's, Tarryall, and Platte River ranges rank in 

 heio-ht anions the largest, while for extreme ru^o-edness the 

 Gore and Tarryall Mountains can not well be surpassed. In 

 this district the great mining industries of Colorado are 

 found. 



The geographical features of this area are as follows: Be- 

 tween the Argentine and Georgia Passes a ridge of mount- 

 ains leaves the main chain and follows a course about south- 

 east, and connects with the mountains near the Pike's Peak 

 group on its west side. This is the Tarryall Range, a rug- 

 ged and abrupt granite wall, with several peaks over 12,500 

 feet in height, and most of the others rising above timber 

 line. The greatest depressions in this range are where the 

 Tarryall and South Platte Rivers break through in canons, 

 and where the Ute Pass and Kanosha Pass afford an en- 

 trance to the South Park. To the east of the Kanosha 

 Pass, a few miles, the Tarryall Range separates into two 

 ridges, which run nearly in an eastern direction. The north- 

 ern ridge borders the south side of the North Platte River, 

 and is called the Kanosha, or Platte River Range. In this 

 ridge volcanic peaks are found in great numbers. The 

 mountain ranges in this portion of Colorado continually 

 throw off spurs which are remarkable for the deep gorges 

 which have been worn down their sides. 



After completing the survey of Platte River, Tarryall, 

 and the South Park districts, Mr. Bcchler ascended the Ar- 





