GEOLOGY. 633 



quietly into the valleys. The earth cracked from place to 

 place, and engulfed men and beasts in its great fissures. 



236. Grand Geyser of the Firehole Basin in the Yellowstone Region. 



At the time of such a disaster it has been sometimes re- 

 marked that objects were carried by a rotatory movement 

 which is quite inexplicable. The upper layers of the stone 

 pyramids in front of the gate of the monastery of St. 



