Poore, Richard Z.; Barron, John A.; Addicott, Warren O. (1984): Biochronology of the northern Pacific Miocene. Univ. Tokyo Press, Tokyo, Japan, In: Ikebe, Nobuo (editor), Tsuchi, Ryuichi (editor), Pacific Neogene datum planes; contributions to biostratigraphy and chronology, 165-169, georefid:1985-028015