94 ART. 2. — 15. KOTÔ : 



lieald Siebold, Fagus ferruginea Ait., Stijrax, and many other 

 forms of Quercus and Salix. Mr. Yabe who made the prelimi- 

 nary determination of the above, is inclined to consider the bed 

 to be of the Pliocene age. Yabe and Inouye later revisited the 

 same locality and made a collection of the petrifications. Later 

 Mr. Inouyk found another locality of the fossils of the same 

 horizon near Pho-hang at the head of Yöng-il Bay already re- 

 ferred to. 



The hill-pass Ho-dong-chhi commands a view, as far as the 

 eye can reach, over the bay and the precipitous coastal ridge of 

 breccia with Tertiary foothills (PI. XXI. fig. 3) of the Heung- 

 häi ^^ coast. From it we came down to a streamlet and ascend- 

 ed again to a water-shed of Tertiary tuffite covered Avitli dwarf 

 pine trees. The divide of the Söng-iiön-chhr^ is 120 m high, and 

 this seems to be the average height of the headland of Yöng-il, 

 which is built up of the same cream-colored tuffite of the 

 Pliocene Tertiary. In following down the stream southeastwards, 

 we found the stratified tuffite underlaid by massive brown tuf- 

 fite intermingled with débris and the half water-worn gravel bed of 

 a massive rock ^\ which rests, in turn, upon masanitic porphyry *\ 

 The last rock extends northeastwards in the axial direction of the 

 headland of Yöng-il, raising its crest above the surrounding Tertiary 

 hills, and terminating at Cape Tong-eul-päi-'kot^'^ (C. Clonard). 



^) mm 2) ftSc ^ iii.îi 



3) This volcanic gravel has a dark to light-brown groimdmass enclosing porphyritic feklspars 

 and quartz. Under the microscope it was seen to consist of typically corroded feldspars and 

 quartz as porphyritic components, besides a few brownish hornblende crystals, which likewise 

 Lad suffered magmatic resorption. The groundmass is microfelsitic with flowage-structure, 

 sometimes showing bands of felsitic substance. It is the hornblende-tpiartz-feldspar-felsophyre. 



4) By masanitic porphyry I mean that light-brown porphyry having the appearance of 

 the oft-mentioned masanite (p. 21). Porphyritic minerals are idiomorphic feldspars and quartz. 

 Both the plagioclnse and orthoclase are flesh-colored due to slight decomposition. The ground- 

 mass consists of a microgranitic aggregate of quartz and feldspar. It is a kind of laccolithic 

 fjranUfporpliyr)/. 5) ^ ZL 1Ï $ 



