JOURNEYS THEOUGH KOEEA. . 181 



in. Zone. — This is the " Iiikstone Series " proper, consisting of 

 shale, sandstone, conglomerate, with schalstein beds 

 in its upper horizon and harboring a marine fauna in 

 sandstone and shale. The species of Ammonites ^^ 

 hitherto found at Nishi-Nakayama and IshimacJii are 

 as follows : 



1. Hildoceras chrysanthemum Yok. 



2. H. densicostatum Yok. 



3. //. Inouyel Yok. 



4. Grammoceras (.?) Okadai Yok. 



5. Harpoceras sp. 



6. H. sp. 



7. Cœloceras suhfibulatum Yok. 



8. Dactylioceras helianthoides Yok. 



In general aspect the fauna shows a great resem- 

 blance to that of the Upper Lias of England. There 

 seem to be two or more horizons in the Ammonite- 

 bearing layers in the zone. 

 lY. Zone. — This also is composed of an alternation of shale, 

 sandstone and schalstein, the whole being capped 

 with another complex of shales and a coal seam. 

 The higher, coal- bearing complex contains at Nanami 

 an impression of Onichyopsis e longa ta Gey. — a 

 fact which betrays the presence of the upper Jurassic 

 beds, probably representing the Dogger-Malm horizons. 

 The writer is rather disposed to consider this 

 zone correlated to Nos. 4 and 5 of the Kyöng- 

 sang Formation of the peninsular area'l 



1) Yokohama : " Jurassic Ammonites from Echizen and Nagato." This Journal, Vol. 

 XIX. Art. 20. 2) See table, page 170. 



