PEALE.] GIBBON GEYSEE BASIN. 131 



on tlie riglit as it begins the ascent of the hill, was named by Mr. Norris. 

 It is a fissure 3 feet by 10 feet, in the center of a basin measuring about 

 25 feet diameter, on a mound of blackish-gray, hard geyserite. It is 

 probably a fissure in trachyte which is being gradually coated with the 

 deposit formed by the evaporation of the water after the eruptions. 

 The following eruptions were noted: 



Eruiriion No. 1. — Spouted at 4.28 p. m., throwing water 30 feet. Erup- 

 tion lasted 2 minutes. 



ErupionNo. 2. — 4^^ 29°^ 45«: Spurt. 4^ 29"^ 55«: Eruption began; 

 interval from beginning of first was 1 minute 55 seconds. 4^ 30"" 16« : 

 Eruption ended heavy ; lasted 21 seconds. 



Eruption No. 3. — 4^ 31"^ 15^ : Eruption began ; interval from beginning 

 of No. 2 being 1 minute and 20 seconds. 4^^ SI'" 25^ : Eruption ended, 

 having lasted 10 seconds. 



Eruption No. 4. — 4^^ 32™ 30^ : Eruption began ; interval from beginning ot 

 "No. 3 was 1 minute and 15 seconds. 4^ 32'" 50^ : Eruption ended, having 

 lasted 20 seconds. 



Eruption No. 5. — 4'^ 30"" 10®: Eruption began ; interval from beginning 

 of No. 4 was 4 minutes and 40 seconds. 4'* 3™ 32^: Eruption ended, hav- 

 ing lasted 22 seconds. 



judging from these few observations the geyser has been very well 

 named. The water is thrown to a height of 30 to 40 feet. Between 

 Nos. 73 and 74 there are several muddy i)Ools, and back of the Minute 

 Geyser is a sulphur pool. 



The springs next described are on the right of the wagon road near 

 the gap in the low hills through which the water from the springs just 

 described finds its way from the basin. 



No. 75 is a small spouter sending up steam and water in alternate 

 puffs, the former preponderating. 



No. 76. Old steam sulphur vents and mudholes. 



No, 77. Steaming mud craters in the timber. 



No. 78. Steam vent. 



No. 98. Three fissures in hard deposit, opening into a large basin, in 

 which the water is quiet. Near it is a sulphur spring and steam vents. 



No. 99 is a steam vent back of No. 98. 



No. 100 is still farther back of No. 98 in the timber. 



No. 101 is a milky-blue pool 15 feet long, with a scalloped edge and 

 temperature of 102° F. 



Below this subgroup of springs the water from the first group described 

 joins that from the main basin and spreads out on a broad flat, which 

 has numerous sulphur pools and mud-pots and ponds of standing water. 

 These form the group to be described last, as follows : 



No. 79 is a boiling sulphur spring of turbid water having a tempera- 

 ture of 180°. Another small one near it has a temperature of 175°. 

 There are also a collection of mud pots and lake-like sulphur ponds on 

 this flat. 



No. 80 is a large lake-like sulphur pond, as shown on the map. 



No. 81 is a black sulphur bubbling spring 10 by 15 feet, with a tem- 

 perature of 175^. 



No. 81a is below No. 81, and is a bubbler 3 feet in diameter. 



No. 82 is a clear greenish sulphur spring with a temperature of 186°. 

 Near it is a spouter 2 feet in diameter. 



No. 83 is a circular bubbling sulphur spring about 30 feet in diameter, 

 with a temperature of 176° F. 



No. 84 marlcs the location of a number of shallow sulphur pools and 

 steam vents. 



