72 APPENDIX TO THE KEPORT OF THE SECRETARY. 



some interesting facts concerning- tlie geograpliical distribution of tyi^es, 

 especially those of marine Cretaceous invertebrates. Among the more 

 interesting results of Dr. White's investigations is the recognition of a 

 Triassic fauna in the rocks of Southeastern Idaho. This is of especial 

 interest as being the first discovery of distinctively Triassic invertebrate 

 types in the West, east of those now well known to exist in the Pacific 

 coast region; and also on account of the close relationship of these 

 types with those of the Middle Trias of Euroi^e, while those of the 

 Pacific coast represent the Upper Trias. 



Frimary triangulation. — The prhnary triangulation of 1878 was ex- 

 tended northward from that of 1877 which was begun at Eawlins, Wyo., 

 where it connected with the system of triangulation of the survey of the 

 fortieth parallel. 



The triangulation party, in charge of Mr. A. D. Wilson, left the Union 

 Pacific Eailroad at Point of Eocks, Wyo., on July 28. They traveled 

 northward to the western base of Wind Eiver Eange, where their Avork 

 began. In this range two stations were made, on Wind Eiver and Fre- 

 mont's Peaks. 



Traveling westward from the base of this range, they crossed the head 

 of Green Eiver Basin, and, threading the canon of Hoback's Eiver, they 

 reached the Snake at the head of its canon. 



They followed this stream up to the eastern base of the Grand Teton, 

 where, finding it impracticable to ascend this mountain from the east, 

 they crossed to Pierre's Hole by way of the Teton Pass. From this, the 

 west side, the peak was found to be more accessible, and Mr. Wilson 

 succeeded in reaching, with his instruments, a secondary summit 100 to 

 200 feet lower than the main crest, and distant from it about 400 feet. 

 He reported the true summit to be practically inaccessible. 



From Pierre's Hole the party next went northwest to SaAvtelle's Peak, 

 near Henry's Lake, in Eastern Idaho. On the night following the as- 

 cent of this mountain, all the animals belonging to the party were stolen 

 by Bannock Indians, leaving the party afoot, at least 100 miles from 

 the nearest settlement. 



After carefully caching their instruments, the party made their way on 

 foot across arid plateaus to the Geyser Basins, where they met the par- 

 ties of Messrs. Gannett and Jackson. With their aid, and the kind as- 

 sistance of Mr. James Eccles, an English gentleman who, with a party 

 of his own, was visiting the country, Mr. Wilson was again fitted out, 

 his instruments having in the mean time been recovered, and his work 

 went on with but little delay. 



His next station was Mount Sheridan, the highest jieak of the Eed 

 JVIouutains, in the southern part of the Yellowstone National Park. 

 Thence he visited Electric Peak, near the northern boundary of the 

 l)ark, and the highest summit within its limits. The well-known Mount 

 • Washburn was his next station, and from that mountain he went south- 

 ward, passing around Yellowstone Lake and vq) the Upper Yellowstone, 



