Stratigraphy: Cretaceous volcanic rocks with an age of approximately 142.5 ± 0.3 million years before present.

Distribution: The Che Kwu Shan Formation occurs in the eastern Hong Kong Island and eastern Kowloon, Sai Kung area, Silverstrand Bay and Tseung Kwan O.

Lithology: Eutaxitic crystal-bearing fine ash vitric tuff with minor tuff breccia.

(Eutaxitic fine ash vitric tuff of the Silverstrand Member of the Che Kwu Shan Formation, Silverstrand Bay, eastern New Territories)