Stratigraphy: Early Cretaceous volcanic rocks with ages of approximately 140.7 ± 0.2 million years before present.

Distribution: The Clear Water Bay Formation crops out in eastern Kowloon and eastern New Territories south of the Chek Keng Fault.

Lithology: Flow-banded porphyritic rhyolite lava, rhyolite breccia and eutaxitic vitric tuff.

(Porphyritic rhyolite lava of the Clear Water Bay Formation, High Island Reservoir, eastern New Territories)