JOURNEYS THROUGH KOREA.. 55 



dong ^\ To the south, the reef of the quartz- schist and muscovite- 

 schist"^ standhig vertical (the strike N.SO^E., tlie dip SO^S.E. or 

 vertical) was seen running southwestwards as the continuation of 

 Chyön-dök-san, through which a streamlet flowed southwards in 

 the narrow gorge of Söng-mim-scm or stone gate (PI. VII. fig. 2). 

 Not far from here towards Hai-nam ^\ we were on a low 

 elevation ^^ of spheruhte-porphyry ^^ indirect contact with spotted 

 gneiss. We now entered a new geological terrane whose geologic 

 age and relation to otlier rock-complexes are up to the present 

 not wholly clear to me. F.v. Eichthofen "^^ and L.v. Loczy^^ 

 mention the occurrences of quartz-porphyries and their deriva- 

 tives in China, and, apparently influenced by the European 

 standard of geological formations assigned tliem to the Permian. 

 T. LoEENZ^' cites porplwrites, but not quartz-porphj^ry, in his 

 Permian of Schangtung. During my journey, I naturally looked 

 upon the quartz-porphyry and its diverse derivatives from the 

 standpoint of the late v. Eichthofen, and included the Korean 

 rocks in the Permo-Triasslc ^^ under the name of the Kymg-sang 



1) m ^ m 



2) Under the microscope the rock is seen to be made n\) of flattened quartz grains together 

 with light-brownish sericite. The schist is properly speaking a sericite-quartz-scMst without a 

 trace of orthoclase. 



'^) i^ M '^) PhyöDg-sn-chhi [^ 7jc lllf ) imss. 5) Light-brownish effusives with 



abundant grains and bipyramids of quartz (3 mm) set in the spherulitic groundmass. Altered 

 orthoclase and biotite are nlso i^resent. 



6) The late v. Richthofen (" CJnna" and " ScJuiniitumj ") found quartz- porphyries and tuffs 

 of probably Permian age in East China. Triassic quartz-porphyries and tuffs occur also accord- 

 ing to him from Chu-san via Ning-po to Hong-kong (Zirkel, " Petro(jraphie "). 



7) Ij.v. (Löczy (" Die licUe des Grafen Szi'chcnyi in Ostasien," p. G81) mentions an occurrence 

 of quartz-porjjhyry in association with granite which had erupted at the beginning of the 

 Mesozoic, underlying the Dogger coal seam at Tsin-tschi-shien in western Sze-chuen. He, 

 however, assigned a great age (pre-Carboniferous) to the quarlz-poriihyry in Liang- Chau, Kan- 

 su (p. 657). 



8) " Beiträge zur Geologie u. Palaeontologie von Ostasien." Zdtschr. d. deutchen qeol. 

 Gesell, 57, 1905, S. 18. 



9) "An Orographic Sketch of Korea." This Journal, Vol. XIX, Article 1, p. 15, footnote. 



