ALE.] UPPER GEYSEE BASIN THEEE CRATER GROUP. 239 



ised some 3 feet above the terrace, having a diameter of 5 or 6 feet. The water 

 ached a height of 75 feet or thereabout. * 



We saw but one eruption, which occurred at 8.14 p. m., August 27, 

 ^78. We were on the opposite side of the river at the time, near Old 

 aithful, which spouted near this time, and no observations as to time 



• height were made. The column was, however, fully as high as the 

 le noted by Comstock (75 feet). With the few data it is of course, 

 ipossible to determine either the duration or interval of this geyser 

 he remaining springs of the group are sufficiently described in the 

 ble. 



THREE-CRATEK GROUP. 



This group is located almost due south of the Castle Geyser, from 

 hich it is distant 1,200 feet. It is about 1,800 feet from Old Faith- 

 1, a little south of east from it. It is not in view from either, being 

 grounded by trees. It is named from the principal spring or geyser 

 the collection, and might well be called the mud group, for it con- 

 ins about all the mud and turbid springs of the upper basin. It is 

 so one of the few places in which sulphur is seen in the upper basin. 

 is present, however, in very small quantity. 



Although the table contains the temperatures of 37 springs, as the 

 ap shows, they are but a small part of the whole number. Many of 

 e turbid springs could not be approached on account of the soft 

 ture of the surrounding soil, and but few of th^ mud springs have 

 eir temperatures given. 



* Reconnaissance of Northwestern Wyoming, by Capt. W. A. Jones, in 1873, p. 254. 



