THE BAHAMAS AND BERMUDAS 309 



form successive crust lines of demarcation between the 

 various layers of sand. 



Agassiz again visited the region in 1908, when the 

 quarry back of Miami and the cuttings of the railroad 

 to the south had made some interesting sections which 

 furnished material not available on his previous exam- 

 inations. The results of this expedition were never pub- 

 lished, but from his notes there seems no reason to 

 believe that his views of the formation of that part of 

 the Peninsula were materially changed. 



