Songdo Peninsula | Attraction Guide | K-Travel Mate

Around 80 to 70 million years ago at the end of the Mesozoic Cretaceous period, the Dongnae fault to the east and the Yangsan fault to the west moved, causing the land between the two faults to open and sink, forming the bowl-shaped Dadaepo basin. A large lake was created in this basin, leading to the accumulation of thick sedimentary layers called the Dadaepo Formation. The Dadaepo Formation is further divided into the lower and upper Dadaepo formations based on the characteristics of the rocks (presence of red layers, volcanic material content) and differences in depositional environment. At Songdo Peninsula, the Dadaepo Formation, selected as one of Korea's 150 significant geological outcrops, appears continuously along the coast from lower to upper layers. Alongside the landscape of Songdo Beach, Korea's first public beach, visitors can enjoy geological records such as dinosaur egg nest fossils, calcareous paleosols, veins, and faults.