GEOLOGIC STRUCTUKK OF THE KIUKIU CURVE. 41 



In the part 15. pyroxeiiite with some alternations of clay slate and 

 quartzose sandstone compose the l^alteozoic area. Tracing the strata 

 of the southern coast from east to west, I made the following measare- 

 nu'iits : 



m(r\\ 8W30°, N40°W SW35°, N— S W30°, 



N20°\V SW25°, N35°W SW20°, N— S W10°. 



Thu^ the inclination of rocks is quite similar to those in C and D, 

 and in <'(jntrast to A. On the north-west of Kabira, a little Palaeozoic 

 exposure pierced by andésite, is also inclined towards the west. 



Compact quartzite is found on the mainland A and extends from 

 the southern foot of Omoto-dake to the neighborhood of Nagura and 

 Shikamura. The same rock is also exposed along the sea coast from 

 Xaffura t<3 Sakieda. Near Sakieda there is onlv an alternation of 

 sandstone and compact quartzite ; and finally we find only sandstone 

 at tlie northern end of the quartzite region. The strike of rocks in the 

 former region is almost always E-W, but sometimes nearly N60°E to 

 NTO'^W. The dip, which is generally constant, is very steep; the 

 strata being sometimes vertical, and sometimes inclined to îsT or S 

 with an angle of GO'' or 70°, but never less than 40°. In the eastern 

 part of this region, a thin layer of chiy slate is found in compact 

 quartzite, and has the strike E-W and the dip 870°. The Banna hill, 

 which lies on the north of Shikamura, is composed of an alternation of 

 clay slate and compact quartzite with the strike ]S[50°W and the dip 

 NE 35°. Kocks on the coast between Nagura and Sakieda are in 

 direct contact with granite which has disturbed their layers. The 

 following di]is and strikes have been m.easured northwards from 

 Nagura : 



N 40°W NE 60° Compact quartzite. 



N 6ü°W NE 60° 



N 50°W NE 20° 



N 80° W NE 50° 



