Where: Japan (43.0° N, 144.7° E: paleocoordinates 47.4° N, 134.1° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Senpohshi Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Upper Maastrichtian, chron 30n.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified mudstone

Size class: macrofossils

Preservation: mold/impression

Collection methods: surface (float),

• Repository: National Museum of Nature and Science, Tsukuba

Primary reference: Y. Shigeta, T. Nishimura, and K. Nifuku. 2015. Middle and late Maastrichtian (latest Cretaceous) ammonoids from the Akkeshi Bay area, eastern Hokkaido, northern Japan and their biostratigraphic implications. Paleontological Research 19:107-127 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 167911: authorized by Matthew Clapham, entered by Matthew Clapham on 06.04.2015

Creative Commons license: CC BY (attribution)