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Nakadaira, Lower Sakamotozawa, Yahagi-cho, Rikuzentakada City (Permian of Japan)

Where: Japan (39.0° N, 141.5° E: paleocoordinates 19.4° N, 110.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Hosoo Formation, Kungurian (279.5 - 272.5 Ma)

• In the Kamiyasse area, a late Artinskian–early Kungurian fusulinid Pseudofusulina fusiformis (Schellwien) occurs from near the top of the Nakadaira Formation (Tazawa, 1973, 1976); and some Roadian ammonoids Adrianites sp. and Demarezites sp. occur from the middle Hosoo Formation (Ehiro and Misaki, 2005). Therefore, a Kungurian age has been expected for the lower Hosoo Formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified siliciclastic sediments

Size class: macrofossils

Preservation: cast, mold/impression

Collected by H. Takeda, K. Nakamura, M. Harada

• Repository: Hokkaido University Museum, Sapporo, Japan (UHR)

Primary reference: K. Nakamura. 1960. Dictyoclostus derived from the Middle Permian Kanokura Series and the Lower Permian Sakamotozawa Series of the Kitakami Mountains, Japan. Journal of the Faculty of Science, Hokkaido University, Series 4, Geology and Mineralogy 10:495-511 [M. Clapham/M. Clapham] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 114091: authorized by Matthew Clapham, entered by Matthew Clapham on 09.08.2011

Creative Commons license: CC BY (attribution)