Northeast New Territories, Sedimentary Rock Region

The Northeast New Territories Sedimentary Rock Region provides a relatively comprehensive record of Hong Kong’s geological history spanning approximately 400 million years. The primary rock types include sandstones and conglomerates outcropping at Wong Chuk Kok Tsui, which belong to the continental and shallow marine sedimentary rocks of the Late Paleozoic Devonian period (around 400 million years ago). Additionally, there are Permian (around 280 million years ago) marine sandstones and mudstones outcropping on Ma Shi Chau, as well as Early Jurassic marine sandstones and siltstones (around 180 million years ago) along both shores of the Tolo Channel. Furthermore, the red sandstones, siltstones, conglomerates, and breccias (dating back to the Late Cretaceous period) that outcrop across Port Island, Double Haven, and various outlying islands in Mirs Bay indicate a dry, continental geological environment at that time. Outcropping on Tung Ping Chau are Paleogene (around 56 to 32 million years ago) siltstones and shales, representing the youngest rock strata in Hong Kong. These sedimentary rocks have formed highly diverse landscapes under the influence of various geological and geographical conditions. *Excerpted from: (https://www.cactm.edu.hk/~geography/geoginform(video_photo_ppt)/HKNationalGeopark_parks_n_scenic_intro.pdf)