Geography of DokdoArxivləşdirilib 2007-09-28 at the Wayback Machine truthofdokdo.or.kr, retrieved 2007-08-21, 'Dokdo is composed of alkaline effusive rocks which erupted during the Cenozoic Era. Dokdo began to form about 4.6 million years ago'
Geography of DokdoArxivləşdirilib 2007-09-28 at the Wayback Machine truthofdokdo.or.kr, retrieved 2007-08-21, 'Dokdo is composed of alkaline effusive rocks which erupted during the Cenozoic Era. Dokdo began to form about 4.6 million years ago'