. Annual report. 1st-12th, 1867-1878. Geology. GEOLOGICAL SURVEY OF THE TERRITORIES. 29 are some moderately high basaltic riclges, the highest portion of which has received the name of Kettletop Butte. Market Lake is a kind of sink, probably produced by the spring overflow of Snake Eiver^ and is entirely dry the greater portion of the year. On the morniLjg of June 26^ I started eastward from Market Station toward the huttes^ near the bend of Snake River. The road wound along low basaltic hills, which really form a marked feature over a large portion of this basin. At the present time the surfa
. Annual report. 1st-12th, 1867-1878. Geology. GEOLOGICAL SURVEY OF THE TERRITORIES. 29 are some moderately high basaltic riclges, the highest portion of which has received the name of Kettletop Butte. Market Lake is a kind of sink, probably produced by the spring overflow of Snake Eiver^ and is entirely dry the greater portion of the year. On the morniLjg of June 26^ I started eastward from Market Station toward the huttes^ near the bend of Snake River. The road wound along low basaltic hills, which really form a marked feature over a large portion of this basin. At the present time the surface is perfectly dry, but at some period in the past little streams circulated all over the surface. Fig. 3. wearing out their valleys through the basaltic crust, leaving i^ortions like broad table-tops, (Fig. 3,) occu- pying a greater or less area. From beneath these fragments of the crust, the loose sands have been washed out all around, so that the overlapping edges have fallen down in every direction y from a common center in many instances, basalt tables, snake river basin. It would appear that these hills show that there were several periods of overflow of basalt, that beneath the sand is another floor, and upon this was deposited at the bottom of a lake a thickness of several feet of sand before the upper floor of basalt was formed. The northern por- tion of the basin is covered with thick beds of sand, into which the wheels of our wagons would sink 2 or 3 feet at times. On Camas Greek are some interesting sand dunes. On the northeast side are some conspicuous hills of blown sand, visible at a distance of twenty to forty miles, which indicate that the direction of the winds is from the south- west. Dry Greek, which in the spring season affords a channel for a large body of water, forms a cailon in the basaltic floor, with walls 50 feet high. In midsummer there is no running water. On this creek there is a stage-station called '^ Hole in the Wall,^^ which derives its name
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