]G KOTO : NOTES OX TEE GEOLOGY 



Area is tliick, egg-sliaped, tlie ends of the margin obtuse-angled ; 

 the margin anteriorly rounded, j^osteriorly sloping; the beak 

 prominent, anteriorly inclined, widely separated and inflated ; 

 coarse radial ribs more than 20 in number. Our specimen 

 apparently resembles A. suhcrenata, Lischke, though in details 

 they may differ, if perfect samples are taken in comparison. 



The next in the series is the porous, No, 2. sheet, under- 

 laid by a fine felspar sand bed. Then the lowest, jN'o. 3. sheet 

 of G-7 feet, often Agglomeratic ; and lastly, the bluish-grey 

 sandy clay, consisting of clay, miiscovite, plagioclase and brownish 

 opaque grains probably of Basaltic glass together with carbona- 

 ceous matter. It is remarkable that muscovite is more or less 

 intermixed with in all the sedimen taries. 



Before quitting Gio-o, it should be remarked that the area 

 north of 8ho-clii-kaku, as well as the whole east coast is com- 

 posed of the two upper flows only with or without interstratified 

 beds ; while the rest of the island, as may be seen in fig. ö, are 

 built up of the second and third flows, accompanied with sedi- 

 nientaries, unsurpassed in complexit}'- and in thickness. 



According to Tada, the islands of the Southern Grouj) {PL 

 IV.) of the Pescadores, are geologically of the same type. 

 Counting southwards, they are : — Hatto,^^ with the dependent 

 isle of Sho-gun-o'-^ ; the Smaller and the Larger Biü-sho"'\ so 

 named cat islands from their appearance as seen from a dis- 

 tance ; Tai-sho'^ and Sho-hei"' with columnar Basalt; To-kitsu''* 

 and Hei-kitsu'\ likewise Basaltic ; all being encircled by coral 

 reefs. 



1) A? 2) )ifip:^ 3) 3Stf| 4) ±m 5) /h^ 6) %] 



