160 ART. 3.— B. KOTÔ : 



C. The Minami-daké and Naka-daké Lavas. 

 (South and East Sides.) PL XVII. Figs. 2, 3, 4, 5. 



a) Mode of Occurrence.'^— Although Minami-daké (the south cone) 

 and Naka-daké (the middle cone) are really parasitic to the 

 northern main, the first can match the northern in point of 

 magnitude, and rides on its southern flank. At the first phase of 

 the building-up of this brother giant to a lofty elevation of 

 1,070 -??!., the southern shoulder of the old Sakura-jima volcano 

 must have been already bodily blown ofi' and destroyed when 

 éjecta of preexisting material and of juvenile substance were piled 

 up around the vent of the south cone. Lavas alone without the 

 contribution of breccia'^-* and tuffs cannot form a priori such an 

 overtowering konide. The deep gulch on the west side seems to be 

 the overlapping edge of both the north and south cones, where 

 one expects to find their mutual relations and internal structure. 



As may be seen on Geologic Map, the black Minami-daké 

 lava makes up the entire apical region, while its skirt borders the 

 southern shore on the point of Kannon-zaki between Yuno and 

 Furusato, and further east at Yuno-hama, being interrupted midway 

 by the lava stream of 1779. Besides, the southwestern slope is 

 severally overlaid by the Biyôbu-hira^^ lava of 1475-'76, and the 

 Ohira^^ lava of 1749, and between the two is exposed the infier 

 or wmdow of the old Kita-daké lava at the gulch of Ogawara.^ 

 These three periclinal lavas of flank eruptions complicate the 

 topography and distribution of lavas, both in time and nature. 



1) See ante, p. 35. 



2) Strong clasmatic deposits are exposed along the southern and eastern slopes between 

 the 200- and 400- meter contour lines. 



3) # JSi ^ See postea, p. 166. 



^) :k ^ (spolœn U'hira) The Jam means a flat. 

 5) See ante, p. 154. :>*C fPl J^ 



