Ping Chau
Rocks on Tung Ping Chau are reddish brown in color and fine-grained. This reflects a hot and humid climate during Paleogene that increase oxidation of iron in the rock and a quiet water setting which deposits fine sediments. Fossils of terrestrial plants and evaporites in rocks on Tung Ping Chau indicates that it might be a saline lake during Paleogene.