282 THE GEYSERS OF MONTANA. 
springs have changed their base of operations within a compara- 
tively recent period ; for about midway on the east side of the lower 
basin there is a large area covered with a thick, apparently modern, 
deposit of the silica, as white as snow, while standing quite thickly 
all ad 
ar are the de 
sori pines, which appear to 
hay destroyed by 
the excessive overflow of 
the water and the in- 
down are incrusted 
with the silica, while por- 
tions that hs fallen 
sult. In one “instance a 
green pine- -tree had fallen 
soas to immerse its thick 
that when removec 
the water, and dried in 
the sun, very fair speci- 
mens were obtained.” 
The Upper Geyser 
basin contains the most 
remarkable geysers, of which the first one is the Grand Geyser 
(Fig. 59). Says Hayden :— 
Grand Geyser. 
_ “Soon after reaching camp a tremendous rumbling was heard, 
