PEALE.] 



UPPER GEYSER BASIN THREE CRATER GROUP. 



243 



much. The following are the temperatures obtained on August 30, be- 

 tween 10 a. m. and 11 a. m. 



o Y. 



Surface temperature immediately before tlie eraption — 159 



Surface temperature during the eruption 169 



Surface temperature immediately after the eruption 163 



Surface temperature two minutes after the eruption 156 



Temperature two feet below the surface three minutes after the eruption 179 



The following are the eruptions that were noted : 



No. 



Eraption began. 



Duration. 



Interval of 

 quiet. 



1 



h. m. s. 



10 52 5am 



m. s. 



1 10 



1 05 



57 



45 



1 10 



f 00 



1 00 



1 00 



1 02 



1 06 



59 



1 01 



1 03 



m. s. 



2 



10 56 55 am . 



3 40 



3 



11 02 28 a. m 



4 28 



4 



11 07 45 a. m 



4 20 



5 



11 12 30 a. in 



4 26 



6 



11 17 30 a. m 



3 50 



7 



11 22 25 a. m 



3 55 



S 



11 27 15 a. m 



3 50 



q 



11 32 00 a. m 



3 45 



10 



IL 36 59 a. m ^' - 



3 57 



11 



11 41 51 a. m 



3 46 



T> 



11 46 36a.m 



3 46 



IS 



11 51 22 a. m 



3 45 











1 01/3 



3 57^5 







From the limited time devoted to the examination of this geyser it is 

 impossible to determine whether these are distinct eruptions or only 

 periods of an action that is separated by longer periods of quiescence. 



D. — This is a basin 9^ by 14 feet at the north end of 0, into which it 

 discharges water through a channel 2J feet wide. In this basin is a 

 fissure 2 feet by 5J feet. The basin is yellowish-red and the fissure 

 mottled with lighter colors and greenish at the bottom ; the tempera- 

 ture is 145° F. 



The spring I have just described is northwest of the main group, and 

 is separated from the rest of the springs by trees. A large area of 

 white and gray deposit, on which dead tr. es are standing, slopes toward 

 Iron Si)ring Creek and to the northward from the spring. There is a 

 low-timbered hill between it and the Castle. 



A temperature taken in basin C in 1871 was 178° F., but its charac- 

 ter as a geyser was not noted that year. Its name was given in 1872 by 

 Mr. Bechler. 



Nos. G and 6a. — These are two springs in one basing ^0. 6 is the main 

 bowl, although Ga is the more active spring. No. 6 is a white funnel- 

 shaped basin, with greenish-blue tinted water. The basin is shallow 

 around the spring in Ca, being from a foot to 2 feet in depth. The over- 

 flow from No. 7 flows into 6a. The entire length of 6 and 6a is about 49 

 feet; 6a is 24 feet wide in widest portion, near where the overflow of 

 No. 7 comes in. 



No. 10. This is a boiling, white, muddy spring. The water is milky- 

 white in color, and boils in one corner from under a rock, although there 

 are several points of slight bubbling. The water is four feet below the 

 general level, and has. a temperature of 195° F. In 1872 I obtained a 

 temperature of 190° F. in this spring. 



No. IG is an unimportant pool of irregular shape. The bottom is 

 divided into several basins by ridge-like divisions. 



