PLATE XVI. 



MieroseoiDic textures of the older effusives of the basal forma- 

 tion and the K.ita-daké (North Cone) lavas. 



Fig, ]. — Biotite-vitrodacite or quartz-bearing biùtitc-liyper.stlioiK' trachyandesite, 

 type «, from Oki-kojima. See pages V,\, 15, 24, 29, 'SO, löG. 



Fig. 2. — Splierulitic lioriiblendc-hypersthenc trachyandesite, type j-, from ()l)ama 

 in Prov. Osumi. See pages 13, 15, 24, 29. 



Fig. 3. — Sphernlitic and perlitic liornblende-bearing obsidian of tlie liyjxir- 

 stliene-trachyandesite, ty^x; ß, from Oki-kojima. See pages 13, 15, 24, 29. 



Fig. 4. — Holocrystalline trachybasalt (Aj in Text-fig. 3, p. 14) from the lava- 

 droAMied islet of Karasn-jima. Fresh olivine as well as resorption-rests 

 are seen in the fignre, the latter being represented by aggregates of 

 magnetite "vvhieh looks very mueli like rhünite. See pages 25, 27. 

 Figs. 1-4 are the pre-Sakura-jim.i effusives of the Laiiilli riatean Formation. 



Fig. 5. — Hypersthene-andesite with the phenoervsts of hyperstliene and plagio- 

 clase, and microuoritic patches from the crater-margin f)f tlie top of Ivita- 

 daké, the Xorth Cone. See pages 155, 157. 



Fig. 6. — Magnified texture of the same from another locality on tJie top-crater 

 of Ivita-dake, showing mono-mineralic feldspar-microlites in tlie ground- 

 mass. See pages 155, 157. 



Fig. 7. — Hypersthene-andesite of the Kita-daké rock-ty])e from the parasitic 

 dome of Furuliata on the western slope of Ivita-dalce. See page 15S. 



Fig. 8. — Black vitrohypersthene-andesite with plexus of augite-microlites in 

 the groundmass, representing the Kabano lava-flows on the northM'estern 

 slope of Kita-daké. See pages 158, 159. 



