ammonites
Shiroi, Ueno-mura, Shiroi Formation, Gunma (Cretaceous of Japan)

Where: Japan (36.1° N, 138.8° E: paleocoordinates 45.5° N, 140.9° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Shiroi Formation, Hauterivian (136.4 - 130.0 Ma)

• upper part of the formation

• group of beds-level stratigraphic resolution

Environment/lithology: estuary or bay; lithified shale and lithified sandstone

• brackish-water environment
• dark-gray shale and fine-grained sandstone

Size class: macrofossils

Primary reference: T. Kozai. 1986. Early Cretaceous Pulsidis (Bivalvia) from Japan. Transactions and Proceedings of the Palaeontological Society of Japan 144:479-489 [W. Kiessling/U. Merkel] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 67144: authorized by Wolfgang Kiessling, entered by Uta Merkel on 10.11.2006