Boso TTT-Type Triple Junction: Formation of Miocene to Quaternary Accretionary Prisms and Present-Day Gravitational Collapse - Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin - page 64

Table 1 Diatom zones and estimated ages from subsea samples

Diatom zones

Estimated
age (Ma) Samples NPD NTD

10K#148, R-2 - - - diatom fragments
10K#148, R1-5, 2 NPD12 - 0-0.3 -
10K#148, R1-5, 5 NPD12 - 0-0.3 -
10K#148, R1-5, 11 NPD12 NTD17 0-0.3 -
10K#148, R1-5, 12 NPD12 NTD17 0-0.3 -
10K#150, C-1 NPD12 - 0-0.3 -
10K#150, C-2 NPD12 NTD17 0-0.3 -
10K#151, C-1 NPD12 NTD17 0-0.3 -
10K#151, R-1 NPD4A - 15.2-15.4 D43-D43.2
NPD Neogene North Pacific diatom zones (Akiba 1986 ; Yanagisawa and Akiba 1998 ),
NTD : Neogene low-latitude diatom zones (Barron, 1985 )

Remarks

Fig. 7 Outcrop photos taken from ROV KAIKO-10K . Depths at which photos were taken are
shown. Each view is approximately 3 m wide (Photos courtesy of Tatsuo Oji)

A. ingens f. nodu s, A. ingens f. planus , Denticulopsis hyalina , D. katayamae ,
D. lauta , D. praedimorpha , D. praehyalina , D. simonsenii , D. tanimurae , D. vul-
garis , Thalassiosira grunowii , and others. Reworked species from the Pliocene
were Koizumia tatsunokuchiensis, Neodenticula kamtschatica , Thalassiosira anti-
qua , and T. zabelinae . Fresh-water diatoms such as Aulacoseira spp. and
Stephanodiscus sp. were also recognized in these samples.