200 



EEPOET UNITED STATES GEOLOGICAL SUEVEY. 



WHITE PYRAMID GEOUP. 



This group is 400 or 500 feet back of the Bound Spring Group, at a 

 little higher level, being about 50 feet above the level of the river. We 

 succeeded in getting all the springs of this group mapped, but were 

 ordered to the Lower Geyser Basin before the temperatures of all were 

 taken. The group is named from the white pyramid which stands back 

 of the springs and forms a prominent landmark in this portion of the 

 basin. 



The Punch Bowl has been included in the group, although it is some 

 distance from the rest of the springs. Its drainage, however, joins that 

 from the other springs and goes with it past the white pyramid. 



Springs 1-8 form the principal cluster. West of them are four springs, 

 with spongy mounds, in a marsh; they are not enumerated in the table. 



Springs 9-11 are in the midst of a number of bubbling holes. I have 

 called the cluster "The Bubblers." 



Table of the White Pyramid Group, 



Number and name. 



5. Spray Geyser . 



7. Comet Geyser. 



10 



11+ 



12§ 



i3ir 



14. White Pyramid. 



15. Punch Bowl. 

 ■16 



Size and depth. 



9 feet diameter 



Basin 20 by 25 feet ; a is 7 by 

 5 feet, & is 8 feet wide. 



3 feet diameter 



Has a large platform of de- 

 posit. 



Geyser cone 2| feet high, 19 

 feet long by 7 feet wide ; 

 basin is 15 feet long. 



12 feet deep 



Mound 18 inches high and 

 3 feet diameter, "with an- 

 other only 1 foot high, and 

 a spouting pool between. 

 All are in a large flat basin 

 that connects with No. 6. 

 The basin is about 30 feet 

 in circumference. 



2 feet in diameter. 



5- Bubblers 



Mound about25feetinheight. 



Basin with a crest IJ foot in 



height. 

 5by6feet 



162 

 a 146 

 6 150- 



185 

 a 195 

 6 190 



199 



165 1 



186 to 



200 



Eemarks. 



Turbid spring in grass, under a log. 

 Two openings in one basin. 



Small spouter. 



a is a long gray pool extending under a fis- 

 sure over which is a platform with hole 

 b. Outside is basin c. 



Boils violently at one end. 



Beautiful white and blue basin. • 

 This is a true geyser. For complete descrip- 

 tion see following notes. 



Eeddish and yellow spring in the center of 

 a hard geyserite basin which was once 

 evidently a geyser. 



A small pool with fissure holes near it. 



These springs are surrounded by holes and 

 fissures . Wo were obliged to leave before 

 completing their examination. 



It steams slightly and may have periods of 



activity. 

 This is probably a geyser. 



A small spring near the Punch Bowl. 



* When quiet. § Bulging spring, 



t At the surface ; 11 feet below it is 169. tl Bul)bler. 



X Yellow-lined bulger with red border. 



DESCEIPTION. 



!N'o. 2 is a bulging spring. When first seen it was a spring of two 

 basins, but later the water rose and it was one basin with two orifices at 

 the bottom, the right hand one being the bulger. The temperature here 



