144 



EEPORT UNITED STATES GEOLOGICAL SURVEY. 



it. It consists of a number of small Loles on the side of the butte. 

 They are filled with pebbles, among which the water boils violently. 

 There is a considerable oversow, and the temperature is 197° F. 



No. 33 has the highest temperature (200° F.) in the group. It is a 

 fissure 10 feet long by 2 feet wide, filled with clear, boiling water, from 

 which steam is continually arising. Near it is a quiet gray i)ool. 



The color of the water in a number of the springs in the group is very 

 handsome. In the marsh are a number of vents and minor springs not 

 incluxled in the table. 



SECOND OR THUD GROUP. 



Following the edge of the timber south from the camp location, within 

 about a half a mile we come to the Thud Group. In the i)revious re- 

 ports this was indicated as the second group. It occupies an area of 

 about 16 acres, and fronts the open portion of the basin. Back of 

 it the slopes of the hills are well timbered. The timber separates 

 the group from camp, and a few isolated patches of trees also stand 

 between it and the Fountain Group. The group is named from one of 

 the springs of the group, which makes a thud-like noise when the steam 

 escapes. There are really two springs that have this thud sound, which 

 fact has given rise to a little confusion. The name is given sometimes 

 to the wrong spring. It should, perhaps, be given to the spring which 

 is periodic in its action, and this is ISTo. 3, which, in the descrix3tion of 

 1872, was called Fungoid Spring. However, as both are thud springs, 

 I have retained the names as there used, calling No. 4 the Thud Spring. 

 It is not a geyser in the true sense, as no column of water is thrown out, 

 so far as known. 



Table of Second or Tliud Groups. 



!N"ame and number. 



Size of spring. 



h 



O TO 



gft 



If 

 H 



o 

 u 



a 

 ft's 



a° 



EH 



Kemarts. 



1. Lone Spring 



2. Stirrup Spring . 



9 by 16 feet; 4J 

 feet deep. 



8 by 9 feet ; 5 feet 

 de_p. 



13 by 17 feet; 

 basin, 6 iuclies 

 deep. 



16 by 18 feet; 8 to 



13 feet deep. 

 6 feet diameter; 15 



feet deep. 

 2 feet high; 5 



inches diameter. 

 Irregular, 15 or 18 



by 6 feet ; 1 foot 



deep. 

 4 by 8 feet; 5 feet 



deep. 



4 by 5 feet; 3 feet 

 deep, 



10 by 15 feet; 12 

 feet deep. 



5 feet diameter 



o Ji, 



' 174 



186 



*]87 



a, 195 



6,194 



c,181 



5 Center, 165 

 |Edge, 163 



a, 190 



187 



189 



Cone, 186 



177 



190 

 190 

 165 

 140 



10.30 a.m. 



O Ji. 



Milky-bued water. 

 > TeUow water-way. 



















V Small holes near No. 2. 



3..rungoid Spring. 







\ Thud Spring of 1871 maps. 















4. Thud Spring... 



5. Oak-leaf Spring. 



11.45a.m.. 



39 



tures. 

 Boiling at 3 or 4 centers. 







The cone is near the main 



6. Kidney Spring . 



7. Cliff Spring.... 



8. Jug Spring 



9. Gourd Spring . . 

 10. Eound Spring.. 







spring (5) on same mound. 

 Beautifully colored outlet. 







Light greenish-tinted water. 

 Funnel-shaped basin. 











Square at the base, but gener- 

 ally of gourd shape. 

 Greenish-brown basin. 













* 2 feet below the surface. 



