Where: Japan (38.6° N, 141.5° E: paleocoordinates 39.2° N, 119.0° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Osawa Formation, Spathian (251.3 - 247.2 Ma)

• Os3 unit, middle Spathian, Isculitoides sp. zone

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, gray mudstone

Size class: macrofossils

Preservation: mold/impression

Collection methods: Repository: National Museum of Nature and Science, Tsukuba (NMNS)

Primary reference: Y. Shigeta, Y. Endo, and H. Inose. 2024. Spathian (Late Olenekian, Early Triassic) ammonoids from the Osawa Formation, South Kitakami Belt, northeast Japan. Paleontological Research 28(s1):1-55more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 236974: authorized by Matthew Clapham, entered by Matthew Clapham on 09.11.2024

Creative Commons license: CC BY (attribution)