464 



at Custer July 13 to August 1. From the latter iM)iiit I visited Oreville 

 on 'Inly 17; Sylvan Lake and Ilanieys Peak, Julj' 18 to 21: made a 

 drive ot" 22 miles down French Ci'eek July 22 and 2.'>. and one into the 

 Limestone District near the Wyoming line. .Inly 2") to 30. extending" 

 l)rol»al»ly 30 to 3."» miles northwest of Custer. 



On Anjiiist 1. I moved my camp to Minnekahta, visiting:- I'rinyle on 

 tbeOth. I then joined a ])arty of naturalists from the University of 

 Xebraska. in whose company I remained for the rest of the season. We 

 cami>ed at Hot Sprin<is till August 11. when we moved to Custer. 

 From this jwiut, after visitiug the Harney s I'lak region on August 17 

 to IS. we returned to Lincoln on August 22. 



c^E(»(;iJAiMn . 



The Black Hills are on the boundary line between South Dakota and 

 Wyoming, the larger part lying within the former State. The center 

 is a little east of the intersection of the forty-fourth parallel and one 

 hundred and fourth meridian. The Black Hills constitute an isolated 

 range about 120 miles long north-northwest and south southeast, and 

 40 to 50 miles wide east and west. A little northwest of the Black 

 Hills and separated from them only by the narrow valley of the Belle 

 F()nrche, is another much smaller spur, the Little Missouri ^Mountains, 

 evidently belonging- to the same range. The nearest mountains excei)t 

 those mentioned are the Big Horu ^Mountains to the west and the Lar- 

 amie Mountains to the southwest. These are at a distance of l.~»0 to 

 200 miles and se])arated from the Black Hills, the former by the valleys 

 of the Little Missouri and Powder rivers, the latter bj' those of the 

 Cheyenne and ll^orth Platte. There are no mountains to the north, 

 east, or south. 



Not only are the Black Hills an isolated range, but the surrounding 

 high table-laud is deeply cut on all sides by the branches of the Chey- 

 enne l{i\er. The head of luyankara Creek is due west of the center of 

 the Hills. The creek runs in a northwesterly direction till it empties 

 into the Belle Fourche. This runs northeast and then southeast, empty- 

 ing into Cheyenne River. The bend is north of the range. Not far 

 from the head of the luyankara are the springs of Beaver Creek, a 

 stream which Hows south into Cheyenne River. The latter runs south 

 of the Hills, then changes its course to northeast till it joins the lielle 

 Fourche. and tinally empties into the Missouri Kiver. 



(n;(>t,(>(;v. 



In order to compare the geological and Moral districts of the Black 

 Hills I give a sumnuiry of the geology of the region derived from the 

 i'ep(»rt by Henry Newton on the Ceology and Besources of the Llack 

 Hills of Dakota.' 



lU. s. (Jhj.it. iiii.i (J.-i.l siirv..\ Ml til.- K'l.i ky Mountain Region, 1880. 



