Seoul
The city government of Ansan, southwest of Seoul, said the 4.5-centimetre-long fossil was found by a citizen on Daebu Island last month, Yonhap news agency reported.
It is believed to have belonged to a plant-eating basal ceratopsian dinosaur known as Koreaceratops, which existed on the Korean Peninsula about 120 million years ago during the Albian age.
The phalanx fossil was almost perfectly preserved, officials said.
The city government reported the finding to the Cultural Heritage Administration (CHA) in the country.
The CHA views the remains as having academic value and plans to send it to the National Research Institute of Cultural Heritage for a more detailed study.
In 2000, five dinosaur footprints, likely left about 100 million years ago, were found at a quarry on the island.
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