148 
The American Geologist. September, i904. 
Fig. 3. Sketch map of the Pcninsiila of Korea showing the 
distribution of faults and of axes of folds. 
earth-movenicnts had folded the core of gneiss-granite together with 
the overlying mantle of normal gneiss and mica-schist. The kernel 
of south Korea is the wedge-shaped massive of Chi-ri-san at the 
boundary of Chyol-la Do and Kyong-syang Do. That of the north is 
also the wedge-shaped massive of Kai-ma Land. These Sinian and 
Liau-tung massives, together with their overlying mantles meet each 
other with their apices, and struggle for the supremacy in north-east- 
ern Ham-gyong Do, thus leaving between them the third wedge of low 
neutral land. 
