130 KEPORT UNITED STATES GEOLOGICAL SURVEY. 



which we estimated to reach a height of over 50 feet. The interval be- 

 tween them was one hour and fifteen minutes. They lasted a few min- 

 utes only. 



No. 56 is a blackish, muddy, boiling spring, 8 by 12 feet. 



No. 57 is a gray mudhole, 12 by 20 feet. 



No. 58 is a yellowish mud pool, near a large pond-like quiet pool. 



No. 59 is a bluish-gray boiling pool, 20 feet in diameter. 



No. 60 is a collection of yellow sulphur springs near some large pools. 



No. 61 is a hole in the rocks on the bank of the creek. 



No. 62 is a boiling spring with two centers of ebullition. It opens 

 into the large pond. 



No. 63 is a black sulphur mudhole, 15 by 20 feet, in the timber above 

 No. 60. 



No. 64. Mud pools and springs above a large pond at the head of a 

 grassy gulch. The rocks near these springs appear to be obsidians. 



No. 65 is a bulging sulphur spring, 6 by 8 feet, on a mound, over 

 which the water flows in waves, forming small terraces. 



No. 66 marks the site of some old geyser holes, in which the old de- 

 posit has become converted into hyalite. The sediments were deposited 

 layer on layer, and are to a great extent covered with the soil. 



No. 67 is a clear, vault-like spring, 6 by 10 feet, in which the water is 

 18 inches below the top. There are other springs in the neighborhood 

 of this. 



No. 68. Pearl Geyser. — This geyser is named from the white pearl- 

 like appearance of the deposit around the spring. The basin is about 

 25 feet in diameter, inside of which is a bowl 5 by 6 feet, from which the 

 water bulges, and, judging from the surroundings, at times spouts. 

 The basin has a greenish-gray and yellow-gray border with beautiful 

 white rosette-like formations on tlie outer basin, and pearly deposit 

 lining the edge of the inner basin. The water rises and falls, and had 

 a temperature of 162° F. when it was filling only the inner basin. 



No. 69. Cradle Mud Spring. — This was named from the curious cradle- 

 like mound which the spring has built. At one end is a hood-like 

 mound 2 feet high, from beneath which the mud spurts. The orifice or 

 basin is about 3 feet wide and 5 feet long. The mud is of a dark bluish 

 color and rather thick. 



No. 70 is a small geyser on a hard flat mound of gray and reddish 

 geyserite. The basin is about 20 feet diameter and the central orifice 

 only 18 inches across. The temperature was 180^ F. 



No. 71. Large clear greenish tinted hot steaming pool, near the wagon 

 road as it enters the basin from the south. 



No. 72 is a boiling spring near some sulphur springs. 



No. 73. Ifeiv Geyser. — This consists of two fissures in trachyte. They 

 are parallel, measuring about 15 feet in length by 4 feet in width at the 

 .top and a foot below. In these the water is boiling vigorously. The 

 surrounding rocks are colored brilliantly with red, orange, and yellow. 

 There is no mound and the rocks of the fissures are just beginning to 

 get a coating of geyserite. This probably represents the first condition 

 of a geyser after the fissure fills with water, marking perhaps the second 

 step in the history of a geyser. No. 43 marking the first. The gully 

 leading from the fissures and the character of the surroundings present 

 proof that there are eruptions, but we did not witness any. When we 

 visited them the water was some distance below the top and was in 

 vigorous action. It was perfectly clear, but its temi^erature was not 

 ascerta^ined. 



No. 74 Minute Geyser. — This geyser, which is close to the wagon road 



