280 REPORT UNITED STATES GEOLOGICAL SURVEY. 



TaMe of Island Grouf. 



No. 



Size. 



Depth. 



a 

 P< 



Is 



r 



m 



a 



'S 



c 

 u 

 a 



H 



"■ 1 



1 



Space covered 13 feet 

 long. 



3by 4Jfeet 





186 



182 



*190 

 tl90 

 1192 

 158 



117 



a, 155 

 6,183 



a, 195 

 6,199 



c,197 

 6,198 



a, 197 

 6,197 

 c,199 



80 



3 p. HI- 



°F. 



75 



These are five openings in crust rather; 

 than separate springs. "Water cornea 

 from No. 3. \ 



There are three small openings near 



Light greenish pool, bubbling in four 

 or five places. 



The water, which is about a foot be- 

 low the surface, is generally quiet, 

 only a few bubbles. 



A red-lined pool from which bubbles 

 occasionally escape. 



A depression in which there are two 

 quiet muddy pools, with soapy, 

 looking water. At one end of the 

 depression is a steam vent. 



There are five vents or openings, all 

 continual spouters. Around the 

 edges of the spring is a dark gey- 

 serite border with a yellow water- 

 way. 



The orifices are 1 to 2 inches, cone 



2 





3 



11 by 21 feet 



6 to 10 feet.. 



3f6et 



3ifeet 





75 



75 



75 

 75 



75 

 75 



4 



6by ejfeet 



5 



11 by lljfeet 



6 



Depression, llj feet 

 by 14 feet 8 inches : 

 a, 2 feet by H feet; 

 &, 10 by 20 inches 



9J by 6| feet outside 

 basin. Principal 

 openings: a, H by 

 2i feet ; h, 2J by 3i 

 feet. 



a&c, three small cones; 

 basin of c measures 

 4 by 5 feet. 



Basin 9 feet 9 inches 

 by 15 feet 8 inches. 

 Principal openings : 

 a, 11 by 17 inches; 

 6, 4 feet 10 by 6 

 inches ; c, 3 feet by 

 2 feet 8 inches. 



7 





R 





9 





6 inches, diameter ; basin of c shows 

 evidence of spouting. There are two 

 outlets to the river. 



About six openings or vents in basin. 

 Between a and c there ai e two con. 

 stant spouters throwing water 6 

 inches to 2 feet in jets, a is quiet ; 

 c has a raised beaded crater, reddish- 

 brown lined, with one center of 

 ebullition spouting constantly. 



Green-scum pool with three basins. 



10 















* Surface. 



t Six feet below. 



SOUTH GROUP. 



J Eight feet below. 



Following up Slioslioae Creek on the west side from the Island Group, 

 we soon ascend a mound or terrace of siliceous deposit, which rises 25 

 to 30 feet above the creek level. The springs on this mound or ter- 

 race, which extends some distance up the creek, I have divided into two 

 groups, as the drainage from the springs naturally so divides them. The 

 South Base Group is the one first met with, and includes fifteen springs, 

 all but one of them being situated near the base of the hills at the upper 

 margin of the mound. 



On the map published in the report for 1872 only seven or eight of 

 the springs of this group are indicated, and in Professor Bradley's re- 

 port only one of them is particularly referred to, as follows : 



Nearer the base of the hills there are several large hot pools. One of them was so 

 well lurnished with coralliform masses, staudiug in the sliallow water near its edj^e, 

 as to he called the Coral Pool. This measured about 40 by 50 feet, with a shallow 

 border, and a deep central pit about 10 feet across, from which niimerous bubbles of 

 gas were escaping. There is a strong flow of water of the temperature of 160°. 



This spring was easily recognized and the name has been retained. 

 The following table gives the condensed description of the springs of 

 the group : 



