Where: Hokkaido, Japan (42.2° N, 142.8° E: paleocoordinates 48.7° N, 134.0° E)

• coordinate based on nearby landmark

• hand sample-level geographic resolution

When: U1 Member (Urakawa Formation), Santonian (85.8 - 83.5 Ma)

• sample CU02, Orbiculiforma quadrata zone

• bed-level stratigraphic resolution

Environment/lithology: basinal (); lithified claystone

Size class: microfossils

Primary reference: Y. Taketani. 1982. Cretaceous radiolarian biostratigraphy of the Urakawa and Obira areas, Hokkaido. The Science Reports of the Tohoku University, Serie 2: Geology 52:1-76 [W. Kiessling/U. Merkel] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 96034: authorized by Wolfgang Kiessling, entered by Uta Merkel on 07.05.2010