Where: Japan (42.7° N, 142.2° E: paleocoordinates 46.8° N, 131.5° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Nostoceras hetonaiense ammonoid zone, Hakobuchi Formation, Early/Lower Maastrichtian (70.6 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, sandy mudstone

Size class: macrofossils

Collection methods: Repository: Hobetsu Museum, Mukawa, Hokkaido (formerly Mikasa City Museum, Mikasa, Hokkaido)

Primary reference: Y. Shigeta and T. Nishimura. 2013. A new species of Gaudryceras (Ammonoidea, Gaudryceratidae) from the lowest Maastrichtian of Hokkaido, Japan and its biostratigraphic implications. Paleontological Research 17:47-57 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 174606: authorized by Matthew Clapham, entered by Matthew Clapham on 17.11.2015

Creative Commons license: CC BY (attribution)