Calcareous nannofossils from the Sumisu Rift and Izu-Bonin Forearc Basin, supplement to: Firth, John V; Isiminger-Kelso, MaLynn (1992): Pleistocene and Oligocene-Miocene calcareous nannofossils from the Sumisu Rift and Izu-Bonin Forearc Basin. In: Taylor, B; Fujioka, K; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 237-262

John V Firth & MaLynn Isiminger-Kelso
During Ocean Drilling Program Leg 126, we recovered three expanded Pleistocene sections from the active backarc rift (Sumisu Rift) and three expanded Oligocene-Miocene sections from the forearc basin of the Izu-Bonin volcanic island arc. Quantitative analysis of the Pleistocene nannofossils revealed five major assemblages between 0 and LO Ma: Assemblage 1 (Holocene-0.085 Ma) contains dominant Emiliania huxleyi; Assemblage 2 (ca. 0.085-0.275 Ma) contains dominant small Gephyrocapsa and common E. huxleyi and Gephyrocapsa oceanica; Assemblage 3...
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