— Ideal Outdoor Geological Classroom
The area of 3000 hectares in northeast New Territories represents the most comprehensive stratigraphy of sedimentary rocks in Hong Kong, ranging from Devonian sandstone and conglomerate of about 400 million years of age to Paleogene siltstone of 55 million
years old, and is rich in landforms of different earth processes.
Double Haven
As a result of the rise in sea level 6000 to 8000 years ago, the river valleys in Double Haven were flooded, therefore forming indented shorelines with headlands and bays. Famous landforms here include Hung Shek Mun, Camp Cove and Double Island.
The rocks along the north coast of Tolo Channel and at Bluff Head are the oldest in Hong Kong. Ma Shi Chau on the west represents the sedimentary rocks formed some 280 million years ago; various igneous rocks and sedimentary rocks at Lai Chi Chong of south coast were formed 140 million years ago.
Port Island — Bluff Head
Bluff Head (Wong Chuk Kok Tsui) has the oldest rocks in Hong Kong, formed by deposits at estuarine deltas about 400 million years ago (Devonian). Port Island (Chek Chau) is best known for its red conglomerate, sandstone and siltstone. The red colour of these sedimentary rocks has resulted from the iron oxidized about 100 million years ago (late Cretaceous). The layers of those sedimentary rocks are clear and dip gently to the east and into the sea.
Tung Ping Chau
In geological history, Tung Ping Chau has the youngest rocks in Hong Kong which are only 55 million years old. However, its peculiar formations are composed of layers of siltstone, and form a unique sedimentary rock landscape in Hong Kong with various abrasion landforms. Famous landforms here include Lung Lok Shui, Kang Lau Shek and Cham Keng Chau.
For detail information, please visit http://www.geopark.gov.hk/en_landforms.html
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