492 



GEOLOGICAL SURVEY OF THE TERRITORIES. 



Name of station. 



Stcation 5 



Station 8 



Uncompahgre Peak . . 



Station 10 



Station 11 



Station 13 



Handie's Peak 



Station 16 



Rio Grande Pyramid. 



Sultan Mountain 



Silverton 



Station 27 



Station 29 



Station 30 



Station 32 



Mount Sneifels 



Station 34 



Mount Wilson , 



Station 36 .' 



Station 37 



Station 38 



Station 48 



Station 51 



Mean 





^O 



-S cs 0.2 



c3 03 



O rS IH 



.-^ M 



—629 

 -511 

 4-869 

 -223 



—2, 755 

 -544 

 +631 

 +175 

 +407 

 



-3,961 

 —777 

 -160 

 +531 



-4, 258 

 +792 

 —369 

 +914 

 -812 

 —718 

 -320 



—1,061 

 —835 



12, 770 

 12, 960 

 14,337 

 13, 082 

 10, 684 

 12, 895 

 14, 101 

 13, 593 

 13,801 

 13, 298 



9,377 

 12, 491 

 13, 120 

 13, 927 



9, 027 

 14, 162 

 12, 988 

 14, 185 

 12, 538 

 12, 623 

 13,014 

 12, 321 

 12, 518 





18, 399 

 13,471 

 13, 468 

 13, 305 

 13, 439 

 13, 439 

 13, 470 

 13,418 

 13, 394 

 13, 298 

 13, 338 

 13, 268 

 13, 280 

 13, 396 

 13, 285 

 13, 370 

 13, 357 

 13, 271 

 13, 350 

 13,341 

 13, 334 

 13, 382 

 13, 353 



13, 366 



•S.2 



r— I OQ 



Em 



12, 737 

 12, 855 

 14, 235 

 13, 143 

 10,611 

 12, 822 

 13, 997 

 13,541 

 13, 773 

 13, 366 



9, 405 

 12,589 

 13,206 

 13, 897 



9,108 

 14, 158 

 12, 997 

 14,280 

 12,-554 

 12, 648 

 13, 046 

 12, 305 

 12, 531 



2 gt) 



1874. 

 Aug. 1 

 " 6 



10 



12 



14 



15 



17 



22 



31 



31 



3 



4 



6 



9 



10 



11 



13 



14 



15 



20 



30 



6 



Sept, 



Oct. 



With the elevations of these stations determined, the heights of 

 unvisited points were obtained by applying the difference of level, as 

 obtained from the vertical angle, to the height of the station from which 

 the angle was taken. As most of the unvisited points are sighted from 

 many stations, we have for each a number of determinations of which 

 the mean is taken. Many of these points are quite as well determined 

 as some of the stations. 



As it was impossible to connect all the peaks with the scheme of 

 trigonometric levels, it was thought best to give the heights of such as 

 nearly as it could be obtained from the data at hand. 



All these, it must be understood, depend on a single reading of the 

 mercurial barometer, not of the small aneroid. The latter instrument 

 was found to be worse than useless. Only one height depends on an 

 aneroid reading, that is Bear Creek Pass, but as here we bad two differ- 

 ent sets of readings of three different aneroids, compared each morning 

 with the mercurial barometer, I thought best to put the height in the 

 list, but it must not be considered as very accurate. 



In the following table are given, as nearly as may be, the heights of 

 all the peaks in the San Juan country above 13,000 feet, besides stations 

 and other points of interest. Some of the latitudes and longitudes have 

 been calculated, while the others have been taken from Mr. Wilson's 

 plot of his secondary triangulatiou, at a scale of two miles to one inch. 

 Some of these peaks being points of the primary triangulatiou, their 

 , latitude and longitude will be more accurately determined when that 

 work is finished. 



