12 Vol. XLIII., Art. 5. -T. Katô : 



extensively devclopod in this area and is exposed on the road side 

 near tlie Fudono Pass leading from Fudono to Akénobé. It is 

 several meters thick and contains large and small pebbles of flinty 

 hornstone, clay slate, altered porphyrite and other rocks cemented 

 firmly by a sandy matter. The amount and size of the pebbles vary 

 even in different portions of the same bed, the rock frequently 

 grading into sandstone within a small distance. 



A limestone bed is found near the Fudono Pass, a little 

 distant from the road, intercalated between tlie gray shales and 

 resting directly on the conglomerate bed, just described. It is 

 lenticular in form, with a thickness of several decameters. It is 

 light gray in colour and very compact in texture. No characteristic 

 fossil has yet been foimd macroscopically as well as microscopically, 

 except sporadic imperfect remains of crinoid stems. The limestone 

 is of very rare occurrence in the so-called Mesozoic formation of 

 this district, and represents local accumulations of calcareous mud 

 in the Mesozoic sea. 



(C) Dioritic Rocks. 



Dioritic rocks are very extensively exposed in this district. 

 These are all intrusive into the Paleozoic and Mesozoic sediment- 

 aries either in the shape of great masses or in small offshoots. 

 The contact efTects are not conspicuous, though the diopsidization 

 of the slate complex, which is observed here and there near the 

 contacts with the dioritic rocks, is obviously related to the intrusion 

 of the igneous rocks under consideration. Other effects, if present, 

 have been rendered obscure by later hydrothermal and dynamic 

 metamorphisms. Tlie diopsidization will be fully treated in a 

 subsequent chapt(.'r. 



Although all the dioritic rocks in this district belong to the 



