10 ART. 2— S. YOSHIWARA : 



are C(3mposed of coarse-grained sandstones witli shales, and contain 

 many coal-seams and limestone layers. Raised coral reefs are found 

 only near the southern end of the island, and are rather limited in 

 extent; their formation appear to have continued from the Tertiary up 

 to the Recent time. Quaternary sediments usually without coral reefs 

 compose the vast plateau along the whole western coast, which is 

 about one-fourth as wide as the island itself. As to the io-neous rocks, 

 Mr. Ishii has found granite near Sessan, and diorite near Xiitaka-vnmii 

 (Mt. Morrison). The serpentine exposed on the nortli of Pi nan and 

 on the west coast of Kötö island, is probably :i metamorphosed 

 Tertiary gabbro. Andésites are exposed: (1), on the northern end of 

 Formosa, as at Daiton-zan, Kwannon-zan, Kiirun-zan and tlie adjacent 

 hills; (2), on the eastern coast, near Shùkorankei and on the north of 

 Pinan; and (3), on the islands of Kötö and Kwashö, off the south-east 

 coast. The numerous islands of the Höko group are almost all basalt. 

 In Formosa, all the strata, older than Quaternary, are steeply inclined, 

 but the strike is almost always parallel to the longitudinal axis of the 

 island. There have probably existed great fissures along the eastern 

 side, running parallel to this axis; as is partly indicated by the 

 occurrence of volcanic rocks on the islands of Kötö and Kwasho and 

 on the north of Pinan. l^esides the «-eneral sreoloo-ical note, above 

 summarized, Mr. Ishii has given in the same note many valuable 

 descriptions of the mining products of the island. 



Messrs. K. Inoue and S. Yokoyama have also written about the 

 geology of Formosa. Receiitly Mr. Saitö has published his geological 

 sketches of the Zuihö and Kinkwaseki mines, in which he mentiones 

 that the two hills Kiirun-zan and Kinkwaseki-zaii are formed of 

 andésite dykes erupted tln-ough Tertiary sediments. Mr. R. Yama- 

 shita f has, under the direction of Mr. Saitö, examined a number of 



t "eJ^^boßi^S (Ooal-seau)s in the north of Formosa, 190U; in Japanese). 



