-Mk-hife'aii CJeolo^ioal and 

 Biological Survey. 



I'ublicalioii 20; liioloary 4. 

 Plate XVIII. 



.\. fHAXXKL EAST IKoM BKA\"KK LAKE (STATIOX 90V 



H. ( IIAWEL OF \i:H,MiI.l()X 1.AKI-: (STATlOX 2">). 



