204 REPORT UNITED STATES GEOLOGICAL SURVEY. 



Table of the Castle Group. 



2S"mnber and name. 



Size and depth. 



ll 



m 







Remarks. 



16. "WasMub 



5h by 5 or 6 feet 



°F. 



i9i 



198 

 185 





°F. 







3 feet long by 8 inches, or 



foot wide. 

 6 by 7i feet 







others near it. 

 Irregular iissure surrounded 

 by sputtering holes. 



17 a 







18 









edge. 

 Dead holes in the grass. 



19 



11 by 11 feet, 2 to 6 feet deep 



191 

 ClOO 



iioi 



195 

 109 



142 

 188 



*]95 



184 

 1974 

 186" 

 1202 

 171 

 151 



189 

 136 



166 

 140 







Throws water 5 to 10 feet. 



19a 



\ 







196 







19c 



5 J by 6 feet 







Red pool. 



20 



8 by 10 feet 







21 



The outside measures 19 

 feet 6 inches by 19 feet 9 

 inches. 



Spring basin, 14 by 15 feet 

 inside. Depth, 44J feet. 









Beantiful Blue Crest- 







the noted springs, and has 

 frequently b e e'n photo- 

 graphed. 



ed Spring. 

 22....:..... 







> Beautiful springs. 



23 









24 



7 by 12 feet 







A great boiler. 











25 



18 inches by 3 feet 









26 



6 by 10 feet 







Ked, leathery -lined pool, with 

 two gently-boiling centers. 



Spring, witii two basins. 



Greenish, red, and yellow de- 

 posit. 



Gray pool. 



Quiet pool. 



27 



9 by 15 feet 







28 



13 by 14 feet 







29 



6by6feet 







30 



14 by 25 feet 















* 10 feet below the surface. 



1 13 feet below the surface. 



DESCRIPTION. 



Castle Geyser (Plates XIX and XIX a). — This geyser has the most 

 imposing crater in the Upper Basin, and was so named by Langford 

 and Doane in 1870, because of its fancied resemblance to the ruins of a 

 feudal castle, although from most points of view it is more like the ruin 

 of a tower or turret on the end of a platform, suggesting the form of a 

 "monitor iron-clad vessel." It is on the summit of a mound of white 

 and gray deposit that covers about 3 J acres and rises about 40 feet above 

 the level of the river. On this mound, 400 feet back from the river, is 

 the platform on which the cone or turret is situated. This platform is 

 composed of laminated geyserite, and is 100 feet in length by 75 feet in 

 width, and on the north side is 3 feet above the level of the mound. On 

 the south side the geyserite is much broken, and the destruction between 

 the platform and the mound is not marked. The turret or cone is 

 towards the west end of the platform, as viewed from the north, and 

 rises 11 feet 11 inches above it, with a circumference at the base of 120 

 feet. The diameter on top is 20 feet. The contour is very irregular, 

 especially on the east side, where there are a series of rough steps of 

 globular masses of beaded silica (see Plate XIX). The deposit is very 

 compact, and in many places has a silvery or leaden-gray color. The 

 orifice of the geyser-tube on the summit of the cone is 3 feet in diame- 

 ter, nearly circular, and lined with large beaded globular masses of a 

 dull orange color. Steam is almost'constantly escaping from this orifice, 

 and jets of water occasionally spurt above it in the intervals between 

 the eruptions. 



