132 



DYNAMICAL GEOLOGY. 



levels, inclosing basins, over which the water drips or plunges on its way 

 to the bottom, as illustrated in Fig. 136. Travertine is usually somewhat 

 cellular and concretionary in structure if not in exterior forms, unlike the 

 even-grained material of ordinary limestone. 



136. 



Calcareous formations. Maruraoth Hot Springs, Gardiners River. Phot, by Jacljsoii. 



About the lakes of the Great Basin calcareous deposits have unusual 

 extent and variety of forms, rising often into groups of rounded columns, 



137, 



Tufa deposits, Lalie Mono. I. C. Russell. 



towers, domes, and other shapes. One example, taken from I. C. Russell's 

 Report on Lake Mono (1889), is illustrated in Fig. 137. These deposits 

 are also abundant in other parts of the Basin. 



