PLATE VI. 



Fig. 1. — The plain of Ku-ryoi (>J^ if^) l)ouiKled on tlie west by :i nioiidional 

 ridge (para-gneiss?) on avIioso eastern foot lies tlie cnmnul of the 

 same name Avliicli we see faintly from the east in the plate. 

 See page 44. 



Fig. 2. — ^Yiew from the Sol-chhi pass (yj^ |li^), lying between Kn-ryöi and 

 Sun-chyöu, toward the north looking down the V-shaped valley in the 

 terrane of the green breccia of porpliyrite of the Upper Kyöng-sang 

 formation. The stratification- ])lane and columnar structure of the 

 rock produce a series of falls and rapids in the streamlet (p. 45). 



Fig. 3. — ^Yiew of the Sol-chhi pass (fig. 2 above), as seen from the south 

 near Sun-chyön ()11H^)- The top of the pass is eye-gneiss capped 

 by red, quartziferous tuffs of porpliyrite. The pass, as may be 

 seen in the picture, is the uplifted edge of eye-gneiss with sheets 

 of green porphj'rite, and the south descent is dropped down to 

 the gneiss terrane by equatoiial lines of dislocation. Consequently, 

 the pass appears for a long distance in sharp escarpment which 

 corresponds to the basset of the sheets of porpliyrite (p. 40). The 

 topographic features of the porpliyrite formation are characteristic- 

 ally angular and rugged as in figs. 2 and 3. 



