Where: Japan (35.4° N, 136.6° E: paleocoordinates 22.8° N, 110.2° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Akasaka Formation, Wordian to Wordian (266.9 - 259.5 Ma)

• All the specimens used in this study are in the collections of three museums and two institutions; no information is available about their stratigraphic level in the Akasaka Limestone. However, they are all associated with a black muddy limestone matrix, and it is reasonably assumed that they were derived from either the middle or upper members.

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; lithified, black limestone

Size class: macrofossils

Collection methods: Repository: University of Hokkaido Registration (UHR), Hokkaido University Museum, Hokkaido University, Sapporo

Primary reference: K. Asato and T. Kase. 2021. Gigantic scaphopods (Mollusca) from the Permian Akasaka Limestone, central Japan. Journal of Paleontology 95:748-762 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 220706: authorized by Matthew Clapham, entered by Matthew Clapham on 13.06.2021

Creative Commons license: CC BY (attribution)