JOURNEYS THROUGH KOREA. 123 



somewhat remarkable. It is a dark, coarse-lamellar mica-schist, 

 fall of anclalnsite-crystals (1 J cm long). Under the microscope one 

 finds both the pinitized and fresh andalusite with enclosed biotite, 

 besides large orthoclase enclosing poikilitic quartz. The quartz 

 of tlie general mass presents the typical hornfels- structure. 

 Chocolate-brown, irregular lamellae of biotite and nniscovite are 

 found together with the felted sillimanite. The geological rela- 

 tion of the last two contact rocks is unknown to me. 



Tlie marl series is overlaid by a red conglomerate which 

 consists of orthogneiss, reddish porphyrite, and marl, striking 

 northeastwards with the southeast dip. The sedimentaries make 

 low mountains on the high flat (300 m), above which the popular 

 Mal-i-san ^^ rises precipitously on the south. The transgressing 

 conglomerate peak rests directly upon a gneiss-granite. The 

 eumnäi of Chin-an itself is on tliis sheared ej^e-gneiss. 



Side-excursion from CHIN-AN to YONG-DAM -') and MU-JYU O 



(See sketch map, p. 113.) 



In order to ascertain the eastern extent of the " spatulate 

 area " of the Upper Kyöng-sang formation, it was thought well to 

 make a short digression northwards. 



Following the stream down northwards for 4 hn on the 

 sheared eye-gneiss terrane, Mr. Yabe met with the above- 

 mentioned formation, represented by thick conglomerate of 

 orthogneiss, quartzite, and sandstone, and thin bands of red 

 marl, dipping S.S.E., which conforms to the general orientation 



1) See page 121, and Pis. XXVIII. fig. 2, and XXIX. fi<j. 1. 



2) IE ïl 3) ^ ^ 



