96 PEOCEEDHNGS OF THE GEOLOGICAL SOCIETY. [DcC. 18, 



extensive effects of the direct action of the sea are at the entrance of 

 the harbour on either side. That on the south side (which I 

 visited) is the more cuiious, because the effects are on a larger 

 scale. Crossing over the narrow sandstone platform between Palm 

 Island and the mainland, which is covered at high water, I found 

 myself in an extraordinary spot, where the soft sandstone rock had 

 been worn away by the force of the waves into a variety of fantastic 

 forms. 



Immediately outside Kelung Harbour rises an isolated steep 

 conical rock, Kelung Island, 580 feet above the level of the sea. 

 Prom its peculiar form, and from the fact that between it and 

 the mainland there is everywhere 30 to 35 fathoms water, I 

 should imagine it was some harder rock. There are no trees 

 upon Kelung Island, as there are on the sandstone shores of the 

 harbour; and on its north side, about two cables' distauce, rises 

 a small isolated peak 100 feet high. 



I must not, however, quit the subject of Kelung Harbour with- 

 out expressing my opinion that the land is slowly rising. Evi- 

 dences of this are to be found on both sides of the harbour. Blocks 

 of worn and washed coral strew the beach on the north side, and 

 lie about confusedly at high-water mark, in the neighbourhood of 

 Huin Eock. Similar washed coral blocks lie on the beach, and 

 between tide-marks on the south side, namely on Pahn Island. 

 The sandstone platform between Palm Island and the mainland, 

 which has every appearance of having been excavated by the sea 

 (which has slowly forced a passage through), is now very httle below 

 high-Avater mark ; and ahove the sea-level the sandstone rock bears 

 plain indications of having been marked and worn by the waves of 

 the sea. Beyond the present hmits of the harbour the level plain 

 shows the sea to have once extended so far ; and the inner third 

 of the harbour is so shallow as to be a mere mud-flat at low water. 



The entrance to Sau-o Bay is protected (or jeopardized) by a 

 reef (Sau-o Eeef), which is evidently a great trap dyke running out 

 nearly at right angles to the coast. It makes its appearance above 

 water two-thirds of a mile from the north point of the harbour, 

 and rises at once 70 feet above low water. It extends 600 yards 

 further out, for the most part only just above water. Sau-o Bay is 

 shut in by high hills, for the most part steep, and densely clothed 

 with forest. The formation is that of a compact black slaty rock, 

 having a conspicuous cleavage of varying direction, and being in 

 some places perpendicular to the level of the sea. There is no sand- 

 stone here, though there is abundance of sand upon the beaches. 



It may not be uninteresting, perhaps, if I put together a few 

 remarks upon the general geological features of some islands lying 

 around the northern end of Pormosa, which are but seldom seen, 

 and some of which have never yet been described. My opportu- 

 nities of examining these islands were very limited, and I can only, 

 therefore, pretend to give a fragmentary account of their geological 

 structure ; still I think any authentic information of these remote 

 spots may possess value and interest. 



