JOURNEYS THROUnn KORFA. 57 



hibiting a beautiful fluidal structure ^\ I did not ascertain tlie 

 relation of the t^YO rocks, as T was prevented by snow and 

 lia il storms wliicli unfortunateh' persisted till our arrival at 

 Mok-pho. 



Having started from the orthogneiss basin of Häi-nam "^ hji-xam 

 Avithin the felsophyre terrane, then buried in deep snow, for three 

 days we pushed on our way between felsophyre mountains, and 

 came out unexpectedly on the open tract of YoJio-darl'^, which 

 marks the beginning of a peninsular area, characterized, b}- 

 shallow waters and hillocks, — a peculiar land-feature common to 

 the coast of the Yellow Sea. From here westwards the rock cleaves 

 int(^ irregular slabs on the horizontal plain. The appearance is 

 sheared, bedded, tuff-like, with angular fragments, green chlorit- 

 ic patches and kaolinized feldspar crystals in a light-greenish 

 matrix. It is the same brecciated felsophyre as that of Häi-nam, 

 though perfectly decomposed and coloring the soils red and 

 green. 



After passing over three hill-necks, all trendiug characteristic- 

 ally north-south, within the distance of fourteen kilometres from 

 Häi-nam in a thinly wooded region, we took the left-hand road 



1) Examined under the microscope, the rock consists of .angular fragments cemented by 

 a felsitic substance. Each fragment shows fluidal structure and is built up of x^inkish felsitic 

 bands with granules of sesquioxide of iron, showing optically negafire character in the direction 

 of flows in contrast to the x^ositive character of the colorless alternating bands. Porphyritic 

 crystals .ire somewhat corroded and kaolinized orthoclase. The cementing material is a confused 

 aggregate of quartz grains with fragments of orthoclase crystals. The rock is a brecciated fdsopJqjre. 

 The bands .are prob.ibly comxiosed of chalcedony .and its allies, either quartzin or lutecite. 



2) ïffi ^ 



■3) Mr. Inouyé took the shortest way from here to ;Mük-pho in crossing mountains on the 

 north (120 m) to the head of a cove (Peuk-chhang). On the way, again, orthogneiss is overlaid by 

 felsophyre Avhich is in turn covered V)y a sheet of i)orphyrite. It is of great moment to geologists 

 to know the relation of the two last mentioned rfX'ks, which he had an exceptionally good op- 

 portunity to observe here. Inouyé then proceeded northwest across the headland to Yong-dang 

 opposite to Mok-pho. At about one-third of the way (Hu-tu '\^ g^) from the cove, he foimd a 



