Neogene microfossil biostratigraphies of the Kitakanbara area in Niigata Prefecture and the geomorphology of an unconformity at the base of the Kuwae Formation.
AKIBA, F. Middle Miocene to Quaternary diatom biostratigraphy in the Nankai Trough and Japan Trench, and modified Lower Miocene through Quaternary diatom zones for middle-to-high latitudes of the North Pacific. Int. Rep. DSDP. 1986, 87, 393-481
AKIBA, F. Taxonomy, morphology and phylogeny of the Neogene diatom zonal marker species in the middle-to-high latitudes of the North Pacific. Int. Rep. DSDP. 1986, 87, 483-554