Ingle, J. C., Jr. (1975): Summary of late Paleogene-Neogene insular stratigraphy, paleobathymetry, and correlations, Philippine Sea and Sea of Japan region. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, Initial Reports of the Deep Sea Drilling Project, 31 (Apra, Guam to Hakodate, Japan; June-August 1973), 837-855, georefid:1976-018655