Lam Tsuen River is a good example of a river eroding along line of weakness. Its main stream follows the Lam Tsuen Fault, which runs northeast-southwest, as many other major faults in Hong Kong.

Regarding bedrock: tuff is the dominant rock in the north (Tai To Yan) and southwest (Ng Tung Chai, Kadoorie Farm and Botanic Garden) of Lam Tsuen River basin. Cuboidal blocks and toppled tors are commonly found here.

To the east, the main rocks in the southeast (She Shan and Lin Au) of Lam Tsuen River are granodiorites, which typically weather easily, resulting in a low terrain.


Cuboidal tor

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