Geology and Volcanic Activities of Wollabong-Gunsan, the Oldest Twin Volcanoes in Jeju Island - 고기원(Gi Won Koh); 박준범(Jun Beom Park); 고창성(Chang Seong Koh); 전용문(Yongmun Jeon); 문덕철(Deok Cheol Moon); 문수형(Soo Hyoung Moon); 임재영(Jae Young Im) (지질학회지, 2021)
Keywords: 월라봉; 서귀포층; 군산; 최고기 쌍둥이 화산체; Seogwipo Formation; Wollabong; Gunsan; Ar-Ar age; the oldest twin volcanoes; Ar-Ar 연대