THE GREAT ERUPTION OF SAKURA-JIMA IN 1914. 219 



12) Coal.— A fragment of coal was also collected by Kana 

 near the western vent at an altitude of 300 m. It is a bituminous 

 black coal which, however, shows submetallic lustre on the cleavage 

 plane with a slight tarnish. One may be skeptical on this oc- 

 currence near vents where we could scarcely expect to find it. 

 There is no probability of coal having been carried up this barren 

 mountain-slope by man before the eruption. As similar fragments 

 have been picked up recently by other collectors, they may have been 

 ejected during the first phase of the ti-uption from the bottom of 

 ventholes, possibly from a lignite seam of the tuffite bed. Poor kinds 

 of coal were reported to occur in the Plateau Formation of Tertiary 

 age (?) from the neighboring provinces of Hyiiga and Satsuma. 



13) Summary on the Loose Ejecta.— In summarizing what is said 

 about the loose éjecta, we unexpectedly find a large number of 

 them, both ancient and modern, and many present new features 

 which must have uncommon interest for petrologists, especially 

 ceramicites and gabbroids, the acid and basic pole of augite- 

 andesites respectively. Both are leucolithic, and represent Yogt's 

 anchi-monomineralic, extreme- differentiates of the andesite-magma. 



JNIore particularly, the projectiles of ancient heterogeneous 

 origin are represented firstly, by pseudobombs of the ash-gray 

 Kita-daké rock (pp. 212-214), and secondly, by trass composed of 

 piperno andésite and its pumice of A and C zones (p. 14), besides 

 the Mesozoic slate, and thirdly, by the so-called sandstone, being a 

 glass-soaked pumiceous trachyandesite (pp. 15, 210). The second 

 and third are, so to say, the volcanic recocts of the different 

 members of the Plateau Formation of southern Kyushu. The 

 fourth and the last one is the fritted granite of (?) Mesozoic age. 

 The éjecta of preexisting rocks are exclusively throv/n out during 

 the earlier phases of activity. 



