Previous   |    Next

doi:10.2204/iodp.proc.346.201.2017

Results

At least 23 species belonging to 12 genera were recognized from 90 samples from Holes U1426A and U1426C (Table T2). Sample 346-U1426A-18H-5, 75–77 cm (161.25 m CSF) had the most abundant specimens (50 specimens), whereas most of the discrete samples yielded <5 specimens each. Acanthocythereis dunelmensis, Krithe spp., and Robertsonites tabukii are dominant taxa. Most of the species are found in the Pliocene and Pleistocene strata in the marginal sea coast of the Japanese Islands and the modern seafloor sediments in the marginal sea. Some are reported from modern seafloor sediments in the Arctic Ocean (Gemery et al., 2015) and Alaska Bay (e.g., Brouwers, 1993, 1994). In the Pliocene samples from Cores 346-U1426A-37H to 40H, four taxa were identified: A. dunelmensis, A. tsurugasakensis, Acanthocythereis sp., and Krithe spp. Only three valves were found in the older samples examined (Cores 346-U1426A-57H to 59H): Argilloecia lunata, Argilloecia sp., and Falsobuntonia taiwanica. This is the first systematic report of the Pliocene and Pleistocene deep-sea ostracods in the marginal sea.

Top of page   |    Previous   |    Next