134 



REPORT UNITED STATES GEOLOGICAL SURVEY. 



disintegrating jointed masses of the porphyry which form the underlying stratum and 

 the hill behind the terrace. At only one point is there a strong flow below. This is 

 on the immediate bank of the stream, and the temperature being only 92° indicates a 

 mingling of cold and hot springs.* 



About the center of the valley there is an old spring basin composed 

 of three terraces, rising about 18 inches one above the other, in much 

 the same manner as the terraces on a larger scale at the Mammoth Hot 

 Springs. Here the springs are extinct, and the terraces overgrown with 

 grass. There is considerable lime in the deposits, and a coating of iron 

 lines the channels of the small streams that carry away the overflow of 

 the springs. The varied colored jelly-like deposit is abundant. The 

 springs have doubtless passed their most active period. 



Dr. Hayden, speaking of the deposits, says : 



The old deposit has now become dry, but it was formed into quite large terraces, 

 somewhat like those made by the calcareous springs, with larger reservoirs or pools, 

 instead of the more delicate ones in the Geyser Basin. In the reservoirs and along 

 the channels of the living springs are most beautiful masses or locks of vivid green 

 confervoid vegetation, floating in the water like locks of wool. There are several 

 otheo" flue spriugs, but mostly of low temperature, with the inner surface of the basin 

 covered over with a thick, deep rusty yellow, leathery substance, which gives them 

 the look of a tan-vat. t 



Recapitulation, Gibbon Eiver Springs. 



ITame. 



ITmn- 

 ber of 

 springs. 



Highest 

 temper- 

 ature. 





101 

 12 



8 



f. 



197 









150 









• 



121+ 





The following are the known geysers, with the points that have been 

 obtained : 



N"arae. 



Group or location. 



Interval or period. 



Duration of erup- 

 tions. 



a 

 |2 











Feet. 

 -10 



No. 15 



do 







20 





do 











....do 



Has a double period, 

 one beinfr every half 

 hour, and the other 

 evei'y 6 or 7 days. 





100 





....do 





20 





....do 







50 





....do 







U ew Gevser 



... do 







Minute Geyser 



....do 



75 to 100 seconds 



10 seconds to 2 min- 

 utes. 



40 











. . do 



















The tables just given are not, of course, complete, but give all the 

 data obtainable up to the present time. 



* Bradlev's Report, p. 231. 



t Report U. S. Geol. Survey of Terr, for 1872, 1873, p. 55. 



