9. Breccia, composed of angular and contorted fragments of micaceous schistus, and angular pieces of feldspar and quartz. This rock forms the western end of Hutton's Island[24]: it rises in high rugged cliffs. The angular pieces of schistus are of a similar rock to that described above (8).
10. Dyke, porphyritic granite, composed of white quartz, white feldspar, and bronze-coloured mica. This dyke cuts across the schistus last mentioned, in a direction north-east and south-west. It is nearly vertical, and varies in breadth from nine to forty feet, with numerous ramifications.
11. Dyke of compact whin stone. This dyke is composed of five layers of prisms, whose length is at right angles to the walls of the dyke. It is nearly vertical. Its direction north and south, and is about five feet thick.
MAIN LAND OF COREA.
12. Lead-coloured, fine-grained, micaceous schistus. From the main land of Corea, latitude 36º 10' north, longitude 126º 48' east. The strata lie north-west and south-east, and are nearly vertical; the natives objected to our examining the cliffs, though distant less than a quarter of a mile from the beach.
ANOTHER ISLAND OFF THE COAST OF COREA.
Latitude 34º 23' north, longitude 126º east.
13. Decomposing fine-grained rock; composed of flesh-coloured feldspar, white quartz, and porcelain clay.
ANOTHER ISLAND NEAR THE ABOVE.
14. Rock composed of white feldspar and quartz. The strata of this rock were very much contorted.