JOURNEYS THROUGH KOREA. 187 



1. To begin with the effusives of the neogranites, the first 

 is a fine felsite-like peHtic rock (tuffite) of a fine- banded texture, 

 weathering into red earth. This hght-coloured rock is exposed 

 on the west of Kim-hai (p. 18), overlaid by green porphyrite- 

 breccia. Microscopically, it consists of minute polarizing sphnters 

 of feldspar and amorphous dust. 



2 a. A pinkish, compact, brecciated felsophyre of Häi-nam (p. 

 57, footnote), exhibiting a beautiful fluidal texture. Microscopically 

 the rock consists of angular fragments cemented with a felsitic 

 matrix. Each fragment shows fluidal texture' and is built up of 

 pinkish felsitic bands admixed with granules of sequioxide of iron. 

 Porphyritic crystals are corroded and kaolinized orthoclase. The 

 cementing substance is a confused aggregate of polarizing grains 

 with fragments of orthoclase. When altered it becomes clay- 

 stone -porphyry. 



2 b ". This modification of the brecciated felsophyre has the 

 appearance of a sheared, bedded tuflite, with angular fragments, 

 green chloritic patches, and kaolinized crystals of feldspar in a 

 light-green matrix. When decomposed the rock colours the soils 

 red and green. The appearance of the rock is exactly like that 

 of the green fnsion-breccia of porphyrite (p. 176). Its distribution is 

 wide as it makes up the headland of U-su-ij'ông ^YiVii the northern 

 part of the island of Chin-do (pp. 57 and 61). It is well exposed on 

 both sides of the narrows of the celebrated whirlpool of My'ông- 

 yang-jin, the world- famed Charybdis of Korea. Here the green- 

 flecked, ash-gray brecciated felsophyre has abundant pyramids 

 and corroded crystals of quartz which project out like needle - 

 heads on the wave-beaten surface at the water's edge, presenting 

 a rough scraggy appearance (p. 59). 



1) This as well as No. 2 cl should better be included in No. 1. 



