170 ART. 2. — B. KOTÔ: 



ney in 1901, I saw there sandstones and marls covered by strong 

 beds of green breccia and sheets of green porphyrite — a com- 

 plex which is inseparable and apparently forms a geological unit. 

 Being influenced by the writings on China by the late von 

 RicHTHOFEN, wlio witliout mucli discussion of the subject judged 

 the geology of that country from European standards, I pro- 

 visionally assigned that complex to the Permo-Carboniferous '^ 

 under the name of the " Kyöng-sang Formation ". Later, Mr. 

 Yabe made a happy find of Jurassic plants in its lower horizon 

 and called the bed the Nak-tong series "\ Mr. Inouye has 

 suggested another classification ^\ At the present juncture it 

 becomes necessary for me to recast the meaning of my Kißng-sang 

 Formation and to give a somewhat definite shape to it. It is best 

 to divide the formation into the lower and the upper ; the lower, 

 clastic members should embrace Yabe's Nak-tong series, allotting 

 the red and green eruptive members to the Upper Kyöng-sang Forma 

 tion. This two fold division is well sustained lithologically, and 

 stratigraphicalty as well as palœontologically. The lower, sedimen 

 tary Kyöng-sang formation (the Nak-tong series) makes a curved 

 belt on the north, northwest and west of the Kyöng-sang province 

 flanking the east foot of the granitic So-paik-san range ; the rocks 

 composing it are gray sandstones, and red, green and black marls : 

 the upper, igneous Kyöng-sang formation constitutes a large area 

 in the southeastern quarter of the province ; the rocks are invaria- 

 bly eruptives occurring either in the form of tufi", breccia, or sheet. 

 In the annexed synopsis I give an approximate correlation 



1) ' Orographic Sketch ', pp. 15 and '24. See ante, p. 55, 



2) " Mesozoic Plants from Korea." Jour. Sei. Coll., Vol. XX. Art. 8, p. 5. Also see pp. 36 

 und 86. 



3) " Geology and Mineral Resources o£ Korea." Afem. Imp. Geol. Suru. Japan. Tokyo, 

 1907, Vol. I. No. 1. 



