466 EEPORT UNITED STATES GEOLOGICAL SURVEY. 



made up for the purpose of exploring tliis region. A small escort from 

 Fort Ellis, in charge of Lieut. G. C. Doane, accompanied them. 



This party made quite extensive explorations on the Yellowstone and 

 Madison Kivers. Passing up the Yellowstone by the well-known trail, 

 they travelled completely around the lake, visiting all localities of in- 

 terest along the route, with the single exception of the Mammoth Hot 

 Springs oq Gardiner's River. While near the head of the lake, Mr. 

 Evarts, a member of the party, became separated from the others and 

 completely lost. After suffering untold hardships from hunger and cold , 

 rendering him temporarily insane, this gentleman was at last found near 

 the Mammoth Hot Springs. 



The story of this expedition was graphically told by Mr. l!^. P. Lang- 

 ford, one of the members of the party, in the pages of Scribner's 

 Monthly Magazine ; while Lieutenant Doane, commanding the escort, 

 furnished a brief report accompanied by a map of the route. The fol- 

 lowing year, 1871, Captains Barlow and Heep, U. S. A., made a recon- 

 naissance of this country, and presented the results in a brief report and 

 a map of their route. 



In the same year Dr. Hayden devoted a portion of the season to a 

 reconnaissance of this region, making quite an extended tour through it. 

 The results of this work, including geological reports, maps, &c., were 

 published in the annual report for that year. This was sufficient to fix 

 the public attention upon this great collection of natural wonders, and 

 when Dr. Hayden presented to Congress a proposition to reserve this 

 section from settlement as a National Park it was adopted with little 

 opposition. 



The following year, 1872, Dr. Hayden continued the reconnaissance 

 of the Park and the country to the north and south of it, publishing the 

 i^esults in the report of that year, and in a series of maps. 



This region has, ever since its discovery, proved an attractive field 

 for exploration, aad scarcely a year has passed that some party, under 

 more or less of oflficial sanction, has not traversed it, nominally at least, 

 for purposes of exploration. 



In 1873 Capt. W. A. Jones, TJ. S. A., took a large party through it. 

 He entered it from the head of the Stinking Water, crossing one of the 

 many passes near Mount Chittenden (it is impossible to tell which). 

 After visiting most of the points of interest in the Park he went out via 

 the Upper Yellowstone, on the way verifying the old trappers' legend 

 about the "Two Ocean Eiver," and discovering a practicable pass (Tog- 

 •wotee Pass) and route from the south to the Park. This discovery was 

 by far the most valuable result of the expedition. 



In 1875 Capt. William Ludlow, U. S. A., in charge of a reconnais- 

 sance in Central Montana, made a flying trip to the Park. He devel- 

 oped little that was new save accurate measurements of the Upper and 

 Lower Falls of the Yellowstone, quoted elsewhere. 



YELLOWSTONE NATIONAL PAEK. 

 BOUNDARIES. 



According to the law by which the Yellowstone National Park was 

 created, its boundaries were established as follows : The northern 

 boundary is on the parallel which passes through the mouth of Gar- 

 diner's River. This point, which I have established as accurately as 

 possible, is just 2 miles north of the parallel of 45^ north latitude, 

 which is the northern boundary of Wyoming. The eastern boundary 



