Eocene to Quaternary benthic foraminifers from the Izu-Bonin Arc, supplement to: Kaiho, Kunio (1992): Eocene to Quaternary benthic foraminifers and paleobathymetry of the Izu-Bonin Arc, Legs 125 and 126. In: Taylor, B; Fujioka, K.; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 285-310

Kunio Kaiho
The benthic foraminifer fauna at Sumisu Rift Sites 790 and 791 indicates that a deep open-ocean (>2300 m) or a basin with open-ocean access existed between 1.1 and 0.7 Ma at the time of the initiation of rifting. The appearance of a low- to medium-oxygen fauna (1600-2300 m) between 0.7 and 0.5 Ma suggests that the open-ocean access may have been terminated at this time because of the development of volcanoes and rift flank uplifts...
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