Report of U. S. National Museum, 1899 Me 



Plate 12. 



Wf.:-:': 



I==i= 



J 5 771 eter ' 



\BcLsalt f^Grai^el 



Vis. 2. 



I Spar 



Fig. 3. 

 \ Basalt ^^Oravel 



\^Spa7- ^f*it^fe XTheCcwen 





Views showing Occurrence of Calcite in Iceland. 



Alter Thoroddsen. 



