PEALE] LOWEE GEYSER BASIN SENTINEL GROUP. 177 



Nos. 2-6 form a cluster a little west and north of the Flat Cone. They 

 are on a platform of deposit which is only slightly raised above the gen- 

 eral level. When the water is low in No. 2 all the others appear to 

 have low water, so that there is evidently some connection between 

 them. Only one was seen to spout, although the character of the de- 

 posit about all of them indicates that they have iieriods of eruption. 

 This is the cluster mentioned by Professor Bradley, as follows : 



Still going westward we find in the extreme edge of the valley, on the top of a low 

 mound, a chister of four vents (there are really five, although one is very small), from 

 1 to 2A feet across, quire irregular in shape, and all boiling too violently to allow one 

 to take the temperatures. All were suiTounded by bead-like incrustations. I judge 

 that they all spout moderately.* 



]N"o. 2. Rosette Geyser. — I have given this name to the only known 

 geyser in the group from the occurrence in its outer basin of beautiftel 

 rosette-covered pebbles. Some of these are white on a black ground, 

 others are pink or slightly yellow, and others are pearly. The basin of 

 the geyser is about 20 feet in diameter in its outer dimensions, in which 

 the central orifice or bowl is about a foot in diameter. Surrounding 

 this orifice the inner basin is 2J feet diameter, lined with beautiful yel- 

 lowish-tinted beaded silica. Only one eruption was noted, and this 

 attained a height of about 30 feet as estimated from a distance. The 

 temperature of the water taken some time after, when it was some dis- 

 tance below the surface, was .196° P. 



No. 3. The mound of this spring or geyser is oblong and raised 6 or 8 

 inches, beaded on the outside, and is rather flat on top. Each of the two 

 openings is from a foot to a foot and a half in diameter, and the tem- 

 perature was 198° F. 



Ko. J: is a small hole close to No. 3. 



Nos. 5 and are much like No. 3 in the character of the deposits. The 

 temperatures (195° and 199°) were taken when the water was some dis- 

 tance below the surface. These springs, although few in number, and 

 small, are about the most active in the group, and are, I think, the source 

 of most of the steam that is noticed rising from this locality when one 

 is at a distance from them, although the mound springs may have periods 

 of violence when they give off large volumes of steam. 



No. 7. Steep Cone.— This cone or mound is 20 or 25 feet high, of about 

 the same dimensions as No. 1, and is on the right bank of the creek, in 

 a bend which it has probably caused. The stream has cut into its western 

 side and may ultimately be t"he cause of its destruction. The spring on 

 the summit is nearly circular, about 8 feet in diameter, and like the spring- 

 on the Flat Cone. It has a dark yellow-brown rim raised about 6 inches 

 and handsomely frilled. The deposit on the outside is white stained, 

 with yellow. There are four small channels which carry off the overflow 

 over two sides of the mound. The water in the spring has an inky tint 

 and boils vigorously and has a temperature of 199° F., which is l^more 

 than that observed by Professor Bradley in 1872. In all respects this- 

 spring is similar to the one on the Flat Cone. 



No. 8. Mound Spring. — This is indicated on the map of 1872 as Cone- 

 Spring, but the latter name is so inappropriate that I have changed it 

 to Mound Spring. The mound is very flat, low compared with the two 

 prin(;ipal ones (Nos. 1 and 7). It soon fades out into the general level 

 a!id has on its summit a handsome oval spring and two small vents {a 

 and h). The former has a white basin 10 by 12 feet, in which the water 

 is of a green tint. The rim, which is beautifully scalloped, is raised only 

 3 or 4 inches, and is flat on top. White cake-like pieces of deposit extend! 



* Report U. S. Geo!. Survey of the Terr, for 1872, 1873, p. 238. 

 12 n, PT H 



