Where: Japan (41.2° N, 142.2° E: paleocoordinates 41.2° N, 142.2° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Spongaster tetras irregularis nannofossil zone, Middle Pleistocene (0.8 - 0.1 Ma)

• "The core provided a continuous record from marine isotope stage (MIS) 18 (750 ka) to the present, a period that spanned the Brunhes normal polarity epoch (0–740 ka). The age model of this core was established through measurement of the stable oxygen isotopes of benthic foraminifera and calcareous nannofossil datums (Domitsu et al. 2011)." (Matsuzaki et al. 2014)

•"The stratigraphical interval between sample 35X-5, 47–53 cm (316 mbsf) and 31H-2, 25–31 cm (275 mbsf) in the 902-C9001C core. This zone covers the period from 613 to 516 ka." (Matsuzaki et al. 2014)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: microfossils

Collection methods: Repository: Department of Geology and Paleontology, Tohoku University Graduate School of Science, Sendai, Japan

Primary reference: K. M. Matsuzaki, N. Suzuki, H. Nishi, R. Takashima, Y. Kawate and T. Sakaii. 2014. Middle to Late Pleistocene radiolarian biostratigraphy in the water-mixed region of the Kuroshio and Oyashio currents, northeastern margin of Japan (JAMSTEC Hole 902-C9001C). Journal of Micropalaeontology 33:205-222 [B. Allen/B. Allen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 233708: authorized by Bethany Allen, entered by Bethany Allen on 27.02.2024

Creative Commons license: CC BY (attribution)