Some 570 million years ago, in theCambrian period, nearly 400 million years before the dinosaurs appeared, Rumphius 'slit shells were quietly crawling at a depth of 200 meters near Kuishan Island off the Ilan coast.
5 億 7 千萬年前、比恐龍出現還早近 4 億年的寒武紀，堪稱是海洋活化石的龍宮貝，就已在宜蘭外海龜山島海域 200 米深度裡靜靜的爬行，直到今天。