GEOLOGICAL SUEVEY OF THE TEERITOEIES. 



107 



30 feet and behold a fairy-like palace, adorned with more brilliant 

 colors and decorations than any structure made by human hands. 

 South of the Thud 

 Geyser, as laid 

 down on the chart, 

 there is one large 

 basin, 150 feet in 

 diameter, with a 

 crater within the 

 rim 25 feet in di- 

 ameter. From this 

 inner orifice the 

 entire mass of wa- 

 ter is thrown up 

 30 to 60 feet, fall- 

 ing back into it, in 

 detached glob- 

 ules, like silver. 

 There is a rim 

 around the inner 

 crater 3 feet high. 

 The vast column s 

 of water as it S 

 shoots up, spreads ^ 

 out in falling back, ^ 

 like a natural foun- ^ 

 tain, so that it t- 

 overilowsthe inner % 

 rim for a radius of ^ 

 10 feet. (Fig. 38.) ^ 

 A short distance w 

 south of the Foun- 1 

 tain Geyser is one S 

 of the most re- ^ 

 markable mud- 

 pots in the Fire- 

 Hole Valley. (Fig. 

 39.) The diameter 

 within the rim is 

 40 bj^ 60 feet, and 

 forms a vast mor- 

 tar-bed of the fin- 

 est material. The 

 surface is covered 

 with large puffs, 

 and as each one 

 bursts the mud 

 spirts upward sev- 

 eral feet with a 

 sui^pressed thud. 

 The mud is an im- 

 palpable, siliceous 

 clay, fine enough, 

 it would seem, for 



the manufacture of the choicest ware. The colors are of every shade, 

 from the purest white to a bright, rich pink. The surface is covered 



