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The Geology of Hong Kong (Interactive On-line)
Lok Ma Chau Formation - Csl


Lok Ma Chau Formation, Csl


Stratigraphy:
Carboniferous metamorphosed sedimentary rocks with ages ranging from approximately 354 to 280 million years before present. The Lok Ma Chau Formation stratigraphically overlies the Yuen Long Formation.

Distribution: The rocks of Lok Ma Chau Formation are present in the northwestern New Territories in a northeast-trending outcrop and subcrop stretching from Tuen Mun to Lo Wu, and also between the three islands of West Brother, East Brother and Reef Island.


Lithology: The Lok Ma Chau Formation consists of metamorphosed sandstone and carbonaceous siltstone with graphitic interbeds and conglomerate.


Depositional Environment: The Lok Ma Chau Formation has been interpreted in terms of deposition in neritic swamps within a prograding deltaic environment.




(Graphitic siltstone of the Mai Po Member, Lok Ma Chau Formation, West Brother island)


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