OF THE DEPENDENT ISLES OF TAIWAN. 



15 



No. 1. Ea--alt. 



mdy tuflite. 



gists to get insight into the geological structure, and to study 

 the stratigraphie details, of the whole Pescadores. 



The oft-mentioned three flows and interstratified tuffites as 

 well as the underlying bed are likewise present, and well seen 



especially in that portion that lies 



southwards of 8hô-chi-kaku.^' 

 Between the last-mentioned 

 locality that is situated in the 

 middle of the island and Shii- 

 ba-wan,'-' good sections may be 

 traced, as in fig. 5, in descending 

 order. Under the superficial 

 covering of the ferruginous soil 

 of decomposition from Basalt 

 comes the No. 1.^ Basalt- flow, 

 with its usual columnar struc- 

 ture, of about one foot, and 

 sometimes disappears altogether. 

 The third in the series 

 consists of pelitic sand and 

 loose sandstone, the latter being 

 made up of musooviie, plagioclase, 

 and Basalt-glass. Concentric 

 nodules of hematite are frequent- 

 ly found in them. Saito is 



No. 2. rasait. 



^ . XX >- ^^ .> 



1 el par saul. 



No. .3. Basalt. 



gaiitlv c-lav. 



Fin. ,5. — General profile as seen in the southern 

 tiart of Gic-ô. 



fortunate enough to find in this complex bed casts of an Ai^ca and 

 gasteropod {Turbo) in the matrix of ferruginous fels]3ar sand 

 wdth a little magnetite. Judging from the cast, the shell of the 



1) ^hmn 



