@ Tung Ping Chau
Information from our field-trip booklet (NIE, Mar 2011):
Tung Ping Chau has the youngest rocks in Hong Kong (55 million years old). It is the easternmost outlying island of Hong Kong. The crescent shaped island measures 600 metres long and 200 metres wide, and has a highest point of elevation of only 48 metres above sea level (Hok Hgam Teng in the Southeast). Unlike most other rock types across the territory, the island is made up of sedimentary rock including siltstone, dolomitic siltstone, mudstone, and chert.
This sedimentary rock strata is known as Ping Chau Formation. Many extremely well preserved fossils have been found within the formation. Geologic investigations have confirmed that this formation is the product of sedimentation which took place in Early Tertiary.
For the coastal buffs, various interesting geological features and coastal landforms including a wave-cut platform, sea cliff and sea stacks can be found along the Tung Ping Chau Country Trail.
Information from the signage on the island:
Paleogene Period (~55 million to 33 million years ago)
Sedimentary rock, mainly siltstone deposited in a lagoon under semi-arid climate
* Tin Hau Temple
* Tam Tai Sin Temple
* Old village houses built with siltstone
* Chau Tau Village
* Nai Tau Village
* A Ma Wan: Beach consisting of algae, cobbles and coral fragments
* Kang Lau Shek: Two sea stacks formed by wave erosion
* Lan Kwo Shui: Wave-cut platform emerging above the water surface at low tide
* Lung Lok Shui: Tough chert layer left behind after differential weathering
* Cham Keng Chau: Narrow passage formed by wave erosion along a fault
More information from the Hong Kong Geopark page