The region was subsequently inundated by a shallow sea. Sediments laid down during this time are represented by the Carboniferous marble of Yuen Long and Ma On Shan.

• 该地区其后遭浅海淹没，期间沉积物不断积聚，元朗和马鞍山的石炭纪大理岩，便是该时期的产物。