JOURNEYS THROUGH KOREA. 133 



Mt Pl-seul-san '^ rising direct and steeply (PI. XXX, jig. 3) from 

 the eumiim. The latter is partly composed of the " black shale 

 series " intruded by a coarse buff-colored masanite of an aplitic 

 habit. The sedimentaries stand witli their backs to the west. 



As I had already touched Tal-hu '^ in the Second Traverse, 

 I then turned southwards to reach Fusan. The new geological 

 terrane is built np of perfectly fissile black shale or rather slate 

 alternating with flinty green tnffite (the strike N.W.-S.E. ( Î ), and 

 the dipN.E.). We made 32 hn through Chliyang -nyong (PI. XXX [I. 

 fig, 1) and Yöng-san along the strike of the complex, intersecting 

 on the way the ronte of the Second Traverse ^' near the former, 

 and touching the laccolite of aplitic masanite near the latter. 

 Tlie people of this district were not friendly. From here we had 

 an excellent opportunity to survey tlie physiography ** of the 

 trench-like hilly land (PI. XYIII. fig. 3) on the right side of the 

 Nak-tong-gang, composed of the lower half of the Kyöng-sang 

 formation. The Nal'-iong-gang following an equatorial tectonic 

 line makes a sudden turn eastward after receiving an affluent 

 from Chin-jyu. The change of the river-course is undoubtedl}' due 

 to a tectonic structure caused by the uplifting of the equatorial 

 Han-san range on the south side of the stream. 



The road leads directly to Ma-san-plio across tlie ferry of 

 Song -j in ^^ which is the upper tide limit in the Nalx-tong-gang. 

 We, however, marched to Sam-nang-jin ''\ now a railway junction, 

 through an equatorial tectonic valley which runs parallel to the 

 transverse course of the river. This transverse valley (PI. XXXU. 

 fig. 2) is an instructive example of a tectonic structure, being 



1) ^ ^ UJ It is the same granitic mountain tbtit was seen from Tai-ku towanl the 



sonthwest. See ante, page 90. It is the western continuation of the fault-scarp which we hatl 



crossed at O-dong. 2) See ante, page 89. 3) See ante, page S8, Mal-li junction. 



4) See ante, page 32 on the mature topography. 5) fô ^ (>) H JJi W- 



