146 GEOLOGICAL SURVEY OF THE TERRITORIES. 



full description of it I refer to Professor Bradley's report. A specimen 

 from this L;ronp was handed to me for analysis. Comi)osition, irregular ; 

 color, rusty brown; fracture, couchoidal; luster, vitreous; hardness, 

 5.5-G. 



Analysis. 



Per cent. 



Loss at 110° C 4.00 



Loss oil ignition 5. 75 



Silica 85. 85 



Iron and alumina 1.94 



Lime L 85 



Magnesia 0. 30 



Soda* Trace. 



Potassa* Trace. 



Lithia* Trace. 



1)9.69 



The Fountain Geyser is the second in importance in the lower basin, and 

 is centrally situated. It is on a slight eminence, and from it the deposit 

 slopes gradually toward the river, studded with innumerable springs. 

 This geyser was fully described in the report for 1871, so I will pass it 

 by here. Back of the Fountain are the Mud Puifs, which were also 

 fully described last year. 1 wish to insert here an analysis, by Dr. End- 

 lich, of a i>ink mud from this locality. A portion of the silica is doubt- 

 less combined with some of the alumina as a silicate. 



A7ialysis. 



Per cent. 



Loss ou ignition 8. 65 



Silica 44.61 



Alumina 45. 09 



Magnesia 2. 66 



Ferric oxide - 1. 86 



Lime - - Trace. 



Soda* Trace. 



102. 87 



Between the Fountain Geyser and the INIud Puffs, we find pieces of 

 wood coated with geyserite, which assumed a beaded form, sometimes 

 branching like certain forms of coral. Most of the specimeus are trans- 

 lucent and have a vitreous luster. The color is generally a light pink. 

 An analysis made by me of this form of geyserite gives the following 

 result : 



Analysis. 



Per cent. 



Water. 10.40 



Silica 88.48 



Alumina and iron .86 



Lime •1'^ 



Magnesia Trace. 



Soda* Trace. 



Potassa* Trace. 



Litbia* •- Trace. 



99. 94 



Wood may be found in various stages of silicification, and if tlu^ ]irob- 

 lem can ever be solved as to tiie i)rocess of silicilication, 1 think a sojourn 

 in the geyser-basins of Fire-Uole River will be of the highest importance 



* By spectroscopic examination. 



