From about 290 million years ago, during the Permian period, a shallow sea spread across the region. Rivers draining the nearby land washed grey silt out onto the sea floor, and during stormy periods layers of sand were sometimes deposited over the silt.
As these sediments accumulated, shellfish and coral remains were sometimes buried within them.
After these sediments were buried and compacted, the layers were severely twisted and deformed by great forces within the Earth's crust.
Today these rocks are found in Tolo Harbour on Ma Shi Chau and Centre Island. Where we see them along the shore, the rock layers are often bent, buckled and split along faults.
Credit : History Museum of HK.
No comments:
Post a Comment