JOUKNEYS THROUGH KOREA. 



179 



is the predominance of the so-called red and green schals teins 

 which are in reality nothing bnt shales or marls exact!}' like the 

 Korean rocks. The red marl contains pentagonal segments (" the 

 plum-blossom stone") of stems of acrinoid (Palœozoic?) and 

 the black shale many obscure casts of a shell. As the red 

 marl affords good material for inkstone (the stone on which the 

 hard india " sumi " is rubbed up with water) the entire upper 

 series is popularly called by Japanese geologists the "Inkstone 

 Series". 



IV. Zone 



III. Zone 



II. Zone 



I. Zone 



Coal. 



Equivalent of tlie Lower 

 Kyöng-sang Formation 

 in Korea. 



Sell (Ammonites) 



Sd 



Sh 



Hornfels witli Epidote- 

 nodules. 



Sd 



Sh 



Hornfels 

 Aplite. 



Eusulina 

 limestone. 



Pi-ofile of the Mesozoic in NagatoProv., 

 schematized after the late Okada. 

 Sell schalstein, Sd sandstone, Sh 

 shale. 



