GEOLOGIC STRUCTURE OF THE RIUKIU CURVE. 49 



Nakara-gnAVJi ; N-S, W 5°-20°, on the upper part of the Urauchi- 

 iraM^a; and N 30°-.t0° E, X W 15° on the east of Uebaru. At a 

 considerable distance from this seam, two other coal-seams, namely 

 the sixth and seventh are said to exist near the summit of Goza-dake, 

 the highest peak in this island. On the northern part of the island, 

 the beds underlying the fifth seam show the same inclination as above 

 stated, and consist of sandstone with thin layers of shale and conglo- 

 merate. Their general strikes and dips, observed on the route from 

 the east of Uebaru to Takana are as follows. Until we reach Intaya 

 we find sandstone showing the strike N o(f-5if E and the dip 

 N W o°-15°, then conglomerate from Intaya to Aka-banare, and 

 sandstone with shale thence tcj Takann, the last mentioned rocks 

 showing the strike N ■iO°-{]0° E and the dip N W 10°-15°, except in 

 the case of some small folds. 



Then comin«' to the east coast, we find on the north of Komi 

 quite different rocks with other inclinations. These are agglomerate- 

 tuff with andésite blocks, and conglomerate with pebbles of Pahpozoic 

 rocks. They are inclined t(j 8 or S W 10°-40°, with the strike E-W 

 or X 30° W, and are probably of the same age as the agglomerate-tuff 

 in Ishigaki-jima. K(jcks found a little to the south of Komi are 

 sandstone with a little shale as in the northern and western parts of 

 Iriomote-jima. On the route thither as far as to a region near 

 Kuira-gawa, the inclination of the rocks is not as regular as that 

 already mentioned for these pai-ts. Near Komi the bedding is 

 variable, being sometimes X o()° E, N VV 15°, sometimes N-S, W 25°, 

 in other cases N 00° E, S E 5.° Thence and until a short distance 

 from Nîdcama, the rocks are regularly inclined to S E 5°-30°, with 

 the strike N" o()°-70° E. I found at Nakama-zaki a thin coal-seam, 

 probably the lowest in the island. The stratification is X 70° W, 

 S W 30° or E-W, S 30° at Xakama, and X 70°-80° E, 8 E 20°-i0° 



