l8 



1 Compact arcose sandstone intercalating a few limestones and containing 

 Plniiolitcs so. 

 RcdlicJna cimicnsis W'alcott 

 In late years, the Cambrian fields in norihern Korea and southern Man- 

 churia were frequented b)' many Japanese geologists ; in 1005, T. Ogawa^^ 

 gave a brief account of the Cambrian stratigraph\' and palaeontology of the 

 region in the Tokyo Journal of Geography, Vol. XVTI., based on materials ob- 

 tained by himself and by N. Fukuchi, N. Kaxehara, Y. Otsuki and S. 

 Kawasaki. In this paper, written in Japanese, he set forth : 



1. The succession of the Cambrian rocks in the vicinity of Liau-yang^' ; 



2. The succession of the Cambrian rocks on the island of Tschang-hsing-tau,^^ 

 off Niang-niang-kung** 25 km SWW of Fu-chou.^^ lie found there miny 

 fossils Avhich he then believed to be new species ; most of these are surely 

 referable to the new species describjd by WAi.corr. 



3. The occurrence of CosciiwcyatJius cfr. billingsi Walcott, and C. sp. 

 (probably new) in a limestone exposed near Sai-ma-ki. 



4 The succession of the Cambrian rocks developed along the Hun-kiang,*^^^ 

 a right tributar)- of the Am-nok-gang (Oryoku-ko),'' where Saltcrclla 

 sp. was found in a limestone lense intercalated in purple shale and lying 

 a little below a greenish limestone with Dorypygc ricjitliofciii and o'.her 

 trilobites. 



At present, our knowledge of the geology of Korea and southern Man- 

 churia is much extended owing to the gradual progre.^s of the geological 

 survey work undertaken by the geologists of the Mining Bureau of the Gov- 

 ernment General of Korea on one side and by those of the Geological Office 

 of the South Manchurian Railway Company on the other. 



A very condensed account of our latest knowledge of Korean .strati- 

 graphy was given in an official bulletin** edited by the Government General 



1) T. Ogawa: The Cambrian Formation of North China. (:|I:^S|5 / ;'7 7' V T/J) 



2) Liau-yang = ^|l 



3) Tschang-hsing-tau = 5:Rflll 



4) Niang-niang-kung = ^g <f g 



5) Fu-chou = ^gfH 



6) Hun-kiang= j^jln 



7) Am-nok-gang-ifll^fl 



8) Explanatory Catalogue of Articles exhibited by the Mining Bureau. 1915- (i!nS5c51^IE 



