U. S. NATIONAL MUSEUM 



BULLETIN 164 PLATE 2 



Type Locality of the ssuyen Formation 

 Just north of Pen-hsi-hu, Liao-tung, Manchuria. 



PEN-HSi-HU Coal Basin, Liao-tung, Manchuria 

 The best locality for the lower fossil horizon of the Ssuyen formation is at S. 



