178 AET. 2. — B. KOTO: 



of Japan. On the geologic map of Japan, one finds a belt of 

 the Mesozoic bed ^^ in the region at the entrance of the Inland Sea 

 (Seto-uchi), extending from the northeast corner of Kyù-shû to 

 the west coast of the main island for a distance of abont 120 

 hn, with the axis from the northeast to the southwest ; and 

 nearly at the centre lies the poi*t of Shimonoseki. 



The Mesozoic complex here developed is likewise divisible 

 into two series corresponding to the peninsular area. 



«) The lower consists of sandstone, shale and a conglomerate 

 of PalsBOzoic gravels. Its basal horizon harbours some EaBtic 

 plants, and the higher the Lias sic Ammonites. Tlie lower horizon 

 is characterized by the absence of schalsteins and the presence 

 of anthracite, the oldest coal found in Japan. 



ß) Tlie upper series is built up of the so-called schalstein, 

 conglomerate and breccia sometimes intercalating the beds of 

 limestone. All is of pyroclastic origin excepting the calcareous 

 beds. This series accompanies sheets of green porphyrite and 

 beds of breccia ; the latter is the green fusion-breccia of porphy- 

 rite, being scarcely distinguishable from the oft-mentioned Korean 

 equivalent. The most characteristic feature of the upper series 



1) Preliminary works on the geology of the Mesozoic bed of this region were carried 

 oixt by Messrs. Okada, InoTiye, Suzuki, and Kochilié. On the pala3ontological side we have the 

 papers by Prof. Yokoyama. 



a) T. Suzuki, "Explanatory Text to the Geological Map, Section Fukuoka " (in Japanese), 

 1894. 



h) K. Inouyé, "Notes on the Geology of Nagato " (MS.). 1896. 



c) 11. Okada, " Geology of The Toyora District " (MS.), 1900. 



d) T. Kochibé, " Explanatory Text to the Geological Map, Section Tsnnoshima " (in 



Japanese), 1903. 



e) T. Suzuki, "Explanatory Text to the Geological Map, Section Yamaguchi " (in Japanese), 



1907. 

 /) M. Y''okoyama, "On some Fossil Plants from the Coal-bearing Series of Nagato" Jour. 



Coll. Sei Vol. IV. PI. II. 1891. 

 g) M. Yokoyama, " Jurassic Ammonites from Echizen and Nagato " IhiJ., Vol. XIX. Art. 



20, 1904. 

 h) M. Yokoyama, " Mesozoic Plants from Nagato and Bitchii," Ihid., Vol. XX. Art. 5, 1906. 



