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Seogwipo’s shellfish fossil is of a type that lies at the shore cliff of southwestern Seogwipo-si. At this cliff, you can see the sedimentary rock and it is covered with the rough side of basalt. At this fossil level, there can be found various fossils of marine life. It has been dated to be 2-3 million years old.
Since then its ecology evolved to a cliff due to a 100 meter wave. Fossils found in Seogwipo are pelecypod, Gastropoda including snails, abalone, freshwater snail, Oysters, brachiopods, echinoderms such as sea urchins, sea cucumbers and starfish, coral fossils, whales and fish bones, shark teeth, and others.
For microfossils, there is a single-cell foraminifera living in the sea. The above-mentioned shellfish fossils do exist today, but most of them are not found near the shore, but more in the warmer southern ocean waters. This shows that when it was accumulated at Seogwipo, the temperature of the ocean at the time was warmer.