Where: Sakhalin, Russian Federation (47.4° N, 142.5° E: paleocoordinates 51.4° N, 130.4° E)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• K4 unit, upper Maastrichtian

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary mudstone

Size class: macrofossils

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

Primary reference: Y. Shigeta and H. Maeda. 2023. Late Maastrichtian (latest Cretaceous) ammonoids from the Naiba area, southern Sakhalin, Russian Far East. Paleontological Research 27:277-309 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 228946: authorized by Matthew Clapham, entered by Matthew Clapham on 22.01.2023

Creative Commons license: CC BY (attribution)