.TOUüNEYS TlIltOüUH KOREA. 21 



M-orn HAvay producing n pumiceous appaaraiice. The rojk is a part of 

 tlie marginal consolidation of the laccolite of Chh/jang-uön. 



The many psciiliar features already Ijriefiy noticed mjike it no easr 

 iask to assign tlie rock to its proper place in the petrological system. 

 It may be a porphyritic aplite, if it be propar to inchide the peripheral 

 mass of the laccolite among dyke rocks, though our rock has rather a 

 coarse structure. It is not a quartz-porphyry, if that term Ix; inider- 

 stood to be applied to effnsives. It is not a microgram te-]^)orphyry in 

 its structure, though the appearance is undoubtedly granitic, ft is 

 somewhat like the fx'uiijtau'de (with the ortlioclase-pheuocryst) of Rinue's 

 Avhich lie considers to be a d3'ke-roek. As our porpln^ritic feldspar- 

 greisen Avitli (juartz-auliedra and plagioclase-phenocrvsts dilïers in some 

 particulars from the rest of the granite family, I venture to propose 

 for this leucocrate the name of laasamtc (plagioclase-tsiugtauite) on -Masanhe 

 account of the occurrence of a granite laccolite near the free port of 

 Ma-san-plLO, of which the masanite forms the psripheral portion. The 

 same rock recurs at tlie Ku-njotyj copper mine near C/ih/oiuj-uOn (p. 22), 

 and mention has been ^dready made of the rock, wliich occiu's as 

 the laccolite of Kc>iiit-jijön<j {p. 15). 



On tlic top of heulchhl (390 }ii), wc again mot with tbo cover 

 (the strike N. 10' E., the dip N.AV.) of the green rtxdc which soon 

 disappeared, being replaced by the masanite as one comes down to 

 Iscul-c]i[/uniak. In passing over tlve low neck of a bill of the same 

 rock to Cliä-i/'o^\ wc followed tbe foot of the liald mountain to 

 Si/aug-(jol'\ where our I'oad johied that from ili/Z-T/cmr/^'. Then we 

 crossed over a hill of masanite to Chlnjang-uön which w^e readied on 

 January 2Gth, 1901. 



CHHYANfr- 



('JtJil/an<j-uöii'^ is a busy, stone-walled ciunmil, and we found ^"^ 

 it crowTled with people from neighboring villages, as it happened to 

 be a chhyaiKj or fair day. The eumnai (PI. 11. Xv- ^^ situated on a 

 1) ê *D 2) J: <& 3) ?g ^ i) â j^. 



