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- Yes, in terms of both volcanic and granite rocks, Stokes' estimate was good i.e. ~50% and 33% respectively. In terms of sedimentary rocks, I think that the phrase 'only a small fraction'
conveys the idea of next to nothing. Indeed, sedimentary rocks are almost the same size as low-lying recent sediment in terms of area. Perhaps the revised amounts (areas) should be
volcanic: 48%
granite: 30%
sedimentary: ~10%
recent sediment: ~10%
reclaimed: ~2% and growing! - Yes, the Pat Sin Leng mountain range fits into the described pattern of northeast to southwest. Broadly, the range runs northeast.
- This is not so easy to confirm. If Lantau was left out (but it cannot) it may be easy to generalize that the east is highest i.e. most rugged and steep. Lantau is in the west and Lantau
is certainly a steep and rugged island. The closely packed contours on the Chek Lap Kok side (north coast) of Lantau are evidence of some spectacular and steep slopes. But if we draw a
hypothetical line north-south down from say Lo Wu to Lamma Island, and then look at the east versus the western 'half' of Hong Kong, we could say that the east is more hilly than the west.
Most of the northwest NT is between 0-100 m elevation according to the topo map.
As for valley narrowness, this requires careful analysis. Using a metric rule and taking notice of the scale (1:100,000) and the compactness of the contour lines, some calculations can be made, e.g. around the High Island and Clear Water Bay areas, the contour pattern indicates steep cliff faces adjoining the South China Sea. A similar pattern can be seen in the contours in inland areas. These indicate steep narrow valleys. I conclude, therefore, that the Stokes' description is a reasonable generalization about the relief or topography of Hong Kong. - Yes, there is topographic evidence for this. A close inspection of map 2 (quaternary geology topography map by HKGS) suggests that islands are an outstanding coastal feature of Hong Kong. Some are large and steep, like Kau Sai Kau. Others are small but still steep (like the tops of former uplands!) like Wang Chau or Tai Chau. It is not too hard to imagine that these steep islands were once hilltops, like say, Nam She Tsim (Sharp Peak) in Sai Kung East country park today!
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