= S. Geological Survey. Plate XXVIII 
Wi 
WA Se A ity \ Wide 
* AN ; 
SESS WS SON > 
SSNS MURA SW 
Sr 
bn See ee 
4 0i/ 4 i Va, f 
Vf. tl 
Wo 
ALS. Vackard del. 
T Sinclair & Son, lith. Phila. 
