Previous   |    Next

doi:10.2204/iodp.proc.346.201.2017

Material and methods

Two hundred and twenty eight samples were collected using 2 cm thick plastic scoops (individual sample volume 34 cm³) in the interval of 120.5–199.7, 294.1–307.3, and 383.4–388.9 m core depth below seafloor (CSF) in Hole U1426A and of 113.4–178.1 m CSF in Hole U1426C. The sampled interval spans the Pliocene to the Pleistocene. All the discrete sediment samples were freeze-dried under vacuum and then washed with water through a 63 µm opening sieve screen. The residual sediments were dried at room temperature. All ostracod specimens were picked from the residues of the >150 µm grain size fraction and transferred to a slide. We identified the taxa using light microscopes and scanning electron microscopes, Miniscope TM-1000 (Hitachi Ltd., Tokyo) at Shinshu University and JSM-6500F (JEOL Ltd., Tokyo) at the Center for Advanced Marine Core Research, Kochi University. We counted specimens of each species without discriminating between valves and carapaces. Juvenile specimens of the genus Krithe were identified as Krithe spp. because early stage valves/carapaces are too similar to distinguish at the species level. The terminology for the morphology of Krithe follows Coles et al. (1994). The taxonomic classification for the rank higher than the genus follows Brandão et al. (2016).

Top of page   |    Previous   |    Next