Abstract
Jeju Island is an intraplate volcanic island. The entire island is a shield volcano of basaltic lava flows and pyroclastic rocks. It contains approximately 360 scoria cones in inland areas and a dozen tuff cones and rings along the coastal region. Scoria cones result from an isolated explosion of basaltic magma with abundant volatile component. Tuff ring and tuff cone are small monogenetic volcanoes produced by explosive magma–water interactions. The Seoguipo Formation consists of mixed basaltic volcaniclastic and siliciclastic gravelly sandstone, sandstone, and sandy mudstone with abundant fossils of mollusks, brachiopods and others mostly of the Early to Middle Pleistocene age. The succession was largely formed in nearshore and inner shelf areas with skeletal banks (channels, lobes, and ridges) shaped by tidal currents as well as storms in the outer shelf. There are several volcaniclastics-dominant units in which no fossils or bioturbation occurs.
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