Where: Russian Federation (47.2° N, 142.5° E: paleocoordinates 51.8° N, 129.9° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Sphenoceramus orientalis inoceramid zone, Miho Group, Early/Lower Campanian (83.5 - 70.6 Ma)

• Matrix contains several small shells of Sphenoceramus, suggesting its derivation from Zone Mh7 (uppermost part of the Miho Group), i.e. the zone of Sphenoceramus orientalis, approximately Lower Campanian in terms of the international scale.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, gray siltstone

Size class: macrofossils

Preservation: cast, mold/impression

Collected by Ohmi in 1955

• Repository: Geological Collection, Kyushu University

Primary reference: T. Matsumoto and K. Muramoto. 1983. Cretaceous nautiloids from Hokkaido - II. Part 2. Three nautiloid species from the Santonian and Campanian of Hokkaido. Transactions and Proceedings of the Paleontological Society of Japan, N.S. 130:85-95 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 166253: authorized by Matthew Clapham, entered by Matthew Clapham on 06.02.2015

Creative Commons license: CC BY (attribution)