180 AKT. 2. — B. KOTÔ: 



T]ie annexed is a sectional column reconstructed, schematized, 

 and also classified mainly from the descriptive profile of the 

 Mesozoic beds of Nagato Province, mentioned in the late Okada's 

 dissertation, " On the Geology of the Toyora District, Nagato " 

 (MS.). 



Tlie basement bed is the Fusulina limestone of the Anthra- 

 colithic age. 



I. Zone. — The above is overlaid discordantly by the Eaetic plant 

 bed of Yamanoi ^\ It contains anthracite layers. The 

 species which Prof. Yokoyama is able to determine are 

 the following : 



''■ 1. CladophJebis nehhensis (Brgnt.) 



2. C. yamanoiensis Yok. 



'•' 3. Dijctiiopliyllum Nathorsti Zeil. 



4. D. japonicum Yok. 



5. D. Kochihei Yok. 



6. Podozamites lanceolatus (Lindl. et Hutt.) 



7. Nilssonia Inouyei Yok. 



■ ''' 8. Baiera paucipartia Nath. 



The species of the florula Nos. 4, 5, and 7 are found 

 only in Japan ; but No. 6 is a form of wide occur- 

 rence in the Jurassic. The important species Nos. 1, 

 3, and 8 are of great moment in assigning the age 

 of the bed to the RDetic epoch, as they are found 

 only in that formation. 

 II. Zone. — This zone is the so-called schalsteinless, being built 

 up essentially of shale and sandstone whicli are 

 barren of fossils. 



1) Yokoyama: "Mesozoic Plants from Nagato and Bitchu," This JirarnaZ, Vol. XX. Art. 5. 



