Where: Hokkaido, Japan (44.9° N, 142.3° E: paleocoordinates 51.2° N, 132.4° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Regosawa Formation (Upper Yezo Group), Santonian (86.3 - 83.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: basinal (); lithified mudstone and lithified siltstone

Size class: microfossils

Primary reference: K. Iwata, Y. Watanabe, and J. Tajika. 1992. Radiolarian biostratigraphic study of the Hakobuchi Group in the Nakatonbetsu area, north Hokkaido. Report of the Geological Survey of Hokkaido 63:1-21 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 95788: authorized by Wolfgang Kiessling, entered by Uta Merkel on 28.04.2010

Creative Commons license: CC BY (attribution)