About 400 million years ago, in the Devonian period, the Hong Kong region was covered by a large river flood plain. From mountains to the southeast, rivers washed sand and rounded pebbles of white quartz out onto the plain.
When floods occurred a layer of mud was spread across the land, providing a soil layer for primitive plants.
As the mountains were eroded, the sea began to cover part of the river plain. In the shallow water, shellfish and the remains of ancient fish called "Placoderms" were deposited in the marine mud.
Rocks from the Devonian period are found in Hong Kong today at Plover Cove, Bluff Head and along the northern shores of Tolo Channel.
Credit : History Museum of HK.
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