. Sixth annual report of the United States geological survey of the Territories, embracing portions of Montana, Idaho, Wyoming, and Utah : being a report of progress of the explorations for the year 1872. Alumina and iron .88 Lime .18 Magnesia Trace. Soda* Trace. Potassa* Trace. Lithia* Trace. Wood may be found in various stages of silicification, and if the prob-lem can ever be solved as to the process of silicification, I think a sojournin the geyser-basins of Fire-Hole Eiver will be of the highest importance * By spectroscopic examination. GEOLOGICAL SURVEY OF THE TERRITORIES. 147 in
. Sixth annual report of the United States geological survey of the Territories, embracing portions of Montana, Idaho, Wyoming, and Utah : being a report of progress of the explorations for the year 1872. Alumina and iron .88 Lime .18 Magnesia Trace. Soda* Trace. Potassa* Trace. Lithia* Trace. Wood may be found in various stages of silicification, and if the prob-lem can ever be solved as to the process of silicification, I think a sojournin the geyser-basins of Fire-Hole Eiver will be of the highest importance * By spectroscopic examination. GEOLOGICAL SURVEY OF THE TERRITORIES. 147 in assisting: ns to conclusions upon the subject. My space here is toolimited to do more than refer to it. The area of the lower geyser-basin is about thirty square miles, andthe valley seems to be underlaid by a sedimentary, probably Post-plio-cene, formation of which part is com[)osed of broken bits of highest temperature that was recorded is 198° F., but there is nodoubt tbat many of the springs are at the boiling-point, (199<^.5 F.,) itbeing impossible to determine it on account of the spoutiug of the general elevation of the lower basin above sea-level is 7,275 At the lower end of the basin the Fire-Hole Eiver is joined by FairyFall Creek, at the head of which there is a beautiful fall called the FairyFall. This fall is 250 feet high, and the water falls into a beautifulbasin at the foot of a cliff. From the mouth of this creek to the mouthof Iron Spring Creek, at the lower end of the upper geyser-basin, thedistance is five and a half miles in a bee-line. Between the two thereIS a large group of springs that can be included in neither, and to whichwe gave the name of the Half-Way Springs ; their general elevation is7,296 feet. These springs were described at length in the report for1871. The illustration () by Mr. Elliot shows one of the princi- 148 GEOLOGICAL SUEVEY OF THE TEEEITOEIES. pal springs in the group. The peculiar laminatio
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