Douglass : A Geological Reconnaissance. 261 



led me through several miles of evergreen forests, where the trees 

 and ground were covered with soft snow, and all was still and beauti- 

 ful, to Elk Park Ranch, then the residence of Mr. Ulrey. Here I 

 remained until the next day, when I rode through wind and storm 

 to Henry's Lake. From Mr. Ulrey's house, I passed for several miles 

 through a park region, consisting of jjine forests and meadows with 

 more brushwood than I had seen the previous day. Several miles south 

 of Henry's Lake, the valley of Henry's Fork becomes nearly treeless, 

 except along the streams, and the country begins to assume more of 

 the aspect of the valleys of Montana. There are benches, which appear 

 to be composed of Tertiary deposits, but I saw no outcrops. The 

 same deposits appear to extend through the Raynold's Pass north of 

 Henry's Lake. It seems quite probable that in Eocene times a river 

 valley extended across the divide here. The altitude of the pass, 

 according to Hayden, is 6,911 feet. 



If it had been earlier in the season, I should have extended my 

 explorations farther to the westward and southward in Idaho, and 

 I have no doubt that I would have succeeded in finding remairs 

 of later Tertiary deposits. They have been observed in the south- 

 western portion of the state. It will be interesting to know what 

 relation the lava-flows bear to these deposits, whether they are be- 

 low or above, or whether they lie between the older and the younger 

 Tertiary beds. 



Henry's Lake, Idaho, to Logan, Montana. 



Soon after crossing the Continental Divide into Montana I left the 

 main road, which descends to the Madison River, and struck westward, 

 as I wished to see Cliff Lake. No regular road, except a wagon-trail 

 from the north, leads to the lake. After descending a ravine in the 

 lava as far as driving was convenient, I unhitched and descended the 

 narrowing gorge on horse-back. After awhile springs were seen 

 issuing from the rocks, soon forming a clear little stream, which made 

 the bottom green as in summer with grass and water-weeds, while all 

 the hills around " were lying brown and bare." The stream flows for 

 some distance through a canon and after passing out from between 

 rocky walls, it expanded into a long, slow-flowing, pond-like stream 

 (really, as I found later, a long inlet of the lake) which turned from 

 the southwestward to the northwestward and was lost behind basaltic 

 cliffs. Ascending a long slope to the northwestward, I came to the 



