Where: Nagano, Japan (35.8° N, 138.1° E: paleocoordinates 48.3° N, 138.2° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Todai Formation, Late/Upper Aptian (122.5 - 113.0 Ma)

• Upper Member

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Preservation: mold/impression

Collection methods: Repository: Hase Fossil Museum in Ina City, Nagano Prefecture (TKB)

Primary reference: M. Matsukawa. 2021. Aptian (Lower Cretaceous) ammonite fauna of the Todai Formation, Nagano Prefecture, Japan. Cretaceous Research 126(104771) [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 220847: authorized by Matthew Clapham, entered by Matthew Clapham on 17.06.2021

Creative Commons license: CC BY (attribution)