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Jodo, an island connected to the mainland by a bridge, has a trail along the coastal cliffs around the island. Igneous and sedimentary rocks (the Taejongdae Formation), formed during the Late Cretaceous, are distributed. In this site, igneous rocks and tuffaceous beds deposited in a lacustrine environment provide useful insights for understanding the volcanic activities and environmental conditions of the Late Cretaceous, manifested by sedimentary structures (i.e. bedding), dikes, faults and deformation structure. There is a gravel beach in the southern coastal area, which can be accessed easily. The Korea Institute of Ocean Science and Technology, Korea National Maritime Museum, and Shell Middens Exhibition Hall are located nearby, and thus this geosite is a good place for on-site multilateral education programs.