98 SCIENCE PROGRESS 



country or absolutely ; these were not connected with volcanic 

 outbursts. Then followed a collapse, and along the faults thus 

 developed inside and parallel to the old ones lava was extruded 

 and explosive volcanoes, like the Rudloff crater, broke out. 

 The two blocks fit into one another like the joints of a telescope, 

 and the last stage of the Askja volcano, judging from the Ries 

 and other caldera, will be that the inner core will rise through 

 the outer rim and finally settle as an elevated block. 



Bibliography 



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Idaho, Bull. U.S. Geol. Survey, p. 199, 1902. 



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