JMicliiKHii CJeoloKifal ami 

 Biological Survey. 



Public at ion liO: Hiology 4. 

 Plate IV. 



SOUTH TWIN LAKE. LOOKIXC XOKIH. SHOWIXCi .\X TXISI AIT.V BROAD 



BEACH lu I- Willi .MAX^■ i:x( ' lioAcii .M i:xis ()i- iiii-: sm ai.i. siiuru y.itSK. 



