PEALE] SHOSHONE GEYSER BASIN WESTEEN GROUP. 279 



The remaining springs of the subgroup are sufficiently described in 

 the table. West of the subgroup is a collection of mud springs, and 

 north of them another subgroup, consisting mainly of large, quiet, and 

 comparatively cold pools. 



iSTo. 37 deserves particular mention, as it is one of the handsomest 

 springs in the group. The water in them — for there are two basins — is 

 of an exquisite blue tint. The two basins are separated by a ridge of 

 geyserite over which the water flows. The largest basin measures 24^ by 

 17 J feet, but has a long arm of 27 feet. The smaller basin is 10 by 16^ 

 fee^t. 



The Nursery Springs are several small springs and sputter-holes. The 

 drainage from this subgroup flows to the north of the group of No. 8. 

 Westward is an open valley extending to the hills. On the south side 

 are two si^rings, the water from which joins the drainage from the Nur- 

 sery Springs, viz, Nos. 34 and 35. No. 34 is a dead pool with a green, and 

 red basin 30 feet long. No. 35 consists of a steam vent and a spring. The 

 spriug is G by 7 feet at the foot of the hill, and pulsates regularly in 

 sympathy with the steam vent. It is 6 inches deex), and has a temper- 

 ature of 198"^. Beautiful rosette-like masses line the outlet. The steam 

 vent is on the side of the hill, 5 or 6 feet above the spring in red muddy 

 deposit. The steam escapes in regular pufis, the intervals being about 

 half a minute in length. 



The only other springs in this group remaining to be described are 

 the Moss Basin (No. 29), and the Boiling Spring No. 33. The first (No. 

 29) is at the head of a subgroup that is almost extinct. It is a red-lined 

 basin 44 by 35 feet. This red lined basin is about 4 inches deep, and 

 at one end is the deeper Moss Basin, back of which is a small circular 

 sining having a temi^erature of 103° F. 



No. 33 is a large blue-tinted boiling spring in a gulch tributary to 

 Fall Creek; it is 32 by 36^ feet, and has a deep basin in the center. 

 There are two ijoints of strong overflow ; the water flows to the creek 

 over a brilliantly colored outlet, yellow being the principal color ; which 

 contrasts with the sky-blue tint of the spring. The hills around this 

 gulch are timbered, and back of them are the remnants of several ex- 

 tinct si)rings. Among them are also some dry mud pots, which in wet 

 weather may become active mud springs, judging from their present 

 appearance. 



Blade Pool No. 43 is detached from the rest of the group lying near 

 the springs of the south group, but, as its drainage is to the southward, 

 it has been included with the Western Group. 



ISLAND GROUP. 



The Island Group is so named from its being opposite islands in the 

 river, and also from the fact of its being isolated. All the springs are 

 small and comparatively unimportant. 



