A COXTKTr.T'TION TO THK CEXU?« FE^^ULTXA. )^>1 



otlier rocks than those of the coal-bearini:; series of Iki and 



FUKÜCIII. 



Admitting the correctness of Felix and Gottsciik's view, 

 there must be at least two divisions of rock series, one post- 

 Rhfetic and the other Anthracolitic. Tiiat tliere is a gradual 

 transition between them is hardly conceivable ; l)iit tlie locality 

 from which Gottsciie collected Araacarioxylon and Cedroxylon 

 not being exactly known, the boundary between these two for- 

 mations is at present also unknown.^' 



I found ?\isulina in specimens of limestone from the follow- 

 ing places near Phyong-yang : — 



I) From a small exposure along the railway cutting near Kai- 

 ka-dong""^ on the southern side of Mu-no-san (coll. by Fukuchi). 



The limestone is compact and dark-grey, traversed by numer- 

 ous irregular fine calcite veins : microscopically no other organic 

 remains than small circular sections of crinoid stems and 



Fusulina sp. indet. aflf. Richthofeni Schwager 

 are found. The latter is very seldoui in the rock. 



II) Ko-pan-san,^' in a valley of (coll. by Ikt). 



The limestone is black in colour and is carbonaceous, also 

 with numerous fine calcite veins. Under microscope, we find 

 Fusulina sp. indet. aff. Richthofeni Schwager. 

 Stacheia sp. 



Bigenerina Bradyi Möller sp. 

 Lagena sp. 



1) At ahoiit ].') ri (^6 km.) west of Phyong-yang appears a thick complex of sand- 

 stone and shales of a nature similar to those to the east and south, but lacking limestone- 

 lenses, and accompanying thick conglomerate beds. What is especially important in Iici's 

 observation is tlie occurrence of limestone-pebbles in the above conglomerate. Iki took 

 this formation as of decidedly younger age than the coal-bearing one, and therefore, it 

 stands without relation to the present problem. 



2) f^J^m •"') '^^n^ t^^'- Ko-pau), 



