106 EEPORT UNITED STATES GEOLOGICAL SURVEY, 



to 'So. 22. They are at tlie foot of a bluff of rock that rises from the 

 river's bauk. The temperatures are from 106° F. to 182°. At the head 

 of the ravine a little farther south there is a steam vent. On the east 

 side of the river^ immediately opposite this locality, there are springs on 

 a bar iu the i:iver, and steam vents and a mud spring on the bluiiy 

 point. 



l^o. 24 designates the next ravine to the south of No. 23, and is the 

 one that brings overflow from Grotto and Grant's Caldron whenever 

 there is any to bring. The springs are on the river edge, and consist of 

 openings iu a conglomeritic sandstone, in which the water has a milky 

 hue. There are also several small mud pots. No. 21 is the principal 

 spring, and comes out from a small grotto-like cavity in the rock, which 

 is lined with a green, red, and yellow coating, probably organic in char- 

 acter. Below the spring is a fissure about 4 feet long and 2 to 3 feet 

 wide ; a and & are openings in this, and are evidently only on the line of 

 waterway from the main spring, which accounts for their lowered tem- 

 perature; c is a fissure in a fine-grained sandstone, which appears to 

 underlie the coarser rock in which No. 24 is located. It is about 3 feet 

 long and gives oft" but little water. The rocks surrounding these springs 

 are tinged with iron. Back of 24 are steam holes, and in the river there 

 are places of bubbling. These springs are about 40 feet below the level 

 of No. 9, and although small, have in the two that are really springs 

 {a and c) the highest temperatures at the locality, with the exception of 

 the mud geyser. 



No. 25. — Following up the ravine which leads from the mud geyser 

 and passing Nos. 4 and 5, we soon come out on a sort of jilateau, and 

 turning to the left find a flat place that was once the seat of mud si>rings. 

 Only one at the present time is active. 



VIOLET CEEEK SPRINGS. 



These springs were not visited by us in 1878, and I therefore quote 

 from my report of 1872 (pages 134 to 136), where they are first de- 

 scribed. Violet Creek is laid down on the accompanying map of the 

 Park as a branch of Alum Creek, near the sources. In my notes of 

 1872 I mention the first group of springs as being about 5 miles north- 

 west of camp (at Mud Volcanoes), whereas those laid down in the map 

 are at least 10 miles distant. The latter are without doubt either the 

 group described by Professor Comstock as " boiling springs near source 

 of Warm Spring Creek " * or are included under his Prairie Group. * 

 Five miles from our caujp would bring us to the sources of the creek into 

 which the drainage from Ci-ater Hills flows, and this is what I understood 

 at the time to be Alum Creek. Violet Creek is therefore a branch of this 

 stream. Une of the groups described iu my report may be included 

 under Professor Comstock's Prairie Group, the description of which I 

 shall quote further on. We had no map with us, and during the season 

 of 1878 I had not the time to revisit the groups, so as to identify them 

 on the later map. I shall therefore simjjly quote the descriptions given 

 in the report for 1872, and add afterwards Professor Comstock's descrip- 

 tions^ in a somewhat condensed form, under the headings given in his 

 report. 



The first spring we met with was on the right bank of the creek, in a siliceous 

 cone-like mound that rises six feet above, the bed of the stream. Its temperature was 

 126° F., the air being at 70° F. The bed of the creek was filled with confervoidea, 

 leading us to suspect that there were springs still farther up. After a further ride of 



*Eeport of Eeconnaissauce of Northwestern Wyoming, p. 216, 217. 



