Smithsonlnn Report, 1 '»4 1 , 



Plate 8 



' -? 



1 . Cones are Built up Around Vents Where Lava or Heated Waters of the 



Geysers issue. 

 "Phis material is deposited in layers. 









'<i 





^. 







2. Sink-hole Depressions Are Quite Common, Either at the vents of Gey- 

 sers Where the Water Wells out or Where Gases Escape from the 

 Heated interior. 



