 Coarse tuffs are found in the northern and south-western parts of the Peninsula and Tap Mun area.Pyroclastic rocks with some lava are found in the eastern part of the Sharp Peak and Sham Chung areas.Acid lavas are found in the area surrounding the High Island Reservoir and the south islands such as Kau Sai Chau, Tiu Chung Chau and Basalt Island, banded acid lava with some welded tuffs are found in the central and southern shore of Pak Tam Chung area.