About 100 million years ago, in the Cretaceous period, the Hong Kong region was a desert.
Rivers in the volcanic hinterland sometimes flooded out across the desert plain depositing layers of gravel, sand and mud.
These sediments are found today as layers of red rock in the northeast of Hong Kong, on Port Island and in the hills around Wu Kau Tang.
There are no fossils in these rocks probably because the region was dry and barren. Dinosaur remains have been found in Guangdong and some species may have roamed the fringes of the Hong Kong's Cretaceous desert.
Credit : History Museum of HK.
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