THE GREAT ERUrTION OF SAKURA-JIMA IN 1914. 29 



basal trachyandesito C (Fv^. 3). PL XVI. Figs. 1, 2, and 3. The gray 

 perlitic ß typo is to be seen in the south island. The upper, 

 pyroclastic beds ^l and B of the Kagoshima type (Fig. 3) are not 

 represented here. The same basal effusi^'e recurs along the coast 

 (Nagahama) at the north of Kajiki on tlie land, whence the view 

 was taken (Fig. ">), and this group is simply a detached mass of 

 the basal portion of the plateau-land of the mainland. 



Since the last eruption, vulcanological literature has rapidly 

 grown. An old book ' Zoku-Nihongi ' says : " In the 8th year 

 of the Tembiù-Hùji era (764 a.d.) an eruption occurred at the 

 frontier of Osumi and Satsuma. In the sea off Shinné village 

 (the present Shikiué ?), three islands were formed of sand, done 

 and lava.'" In another book these are apparently referred to the 

 present group. The identification of the above historic record 

 with the islands in question^^ was fully indorsed by recent writers 

 on Sakura-jima. That this is, however, an erroneous interpretation 

 will be clear by the statement made from a geological point, that 

 the islands are simply detached blocks of an effusive Horizon G 

 of the early Diluvial or late Tertiary age. [See p. 41). 



In saying this, the writer does not deny the truth of the 

 said record, yet he could not locate the point of that eruption in 

 Kagoshima Bay. 



In short, the islands of Oki-Kojima, Hakama-goshi, Karasu- 

 jima, Kanzé and Ko-jima of Kokubu, dotting Kagoshima Ba3% are 

 not only the same in age, in rocks and in structure among them- 

 selves, but also exactly like those of the plateau land that encloses 

 the bay (PI. IV. Fig. 1 and Text-fig. G). As has already been 

 remarked, they are the wedged-up blocks of shattered bottom of 



1) In the 'Explanatory Text to Sheet Kagoshima,' i>. 53, it is said that the island is 

 ])robably parts of a ruined crater. Nishio speaks of them as the foundation-stone of the later 

 Sakura-jima. J'etermanns MiüelL, 1014, S. 132 



