ammonites
Chenaibo coastal cliff plesiosaur (Cretaceous of Japan)

Where: Japan (45.4° N, 142.0° E: paleocoordinates 54.8° N, 135.3° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Chenaibo Formation (Middle Yezo Group), Cenomanian (99.6 - 93.5 Ma)

• not indicated what level sample is taken from, but from same bed as other samples from this reference

• bed-level stratigraphic resolution

Environment/lithology: marine; shale

• The bones are embedded in a large calcareous nodule, which came from a shale bed containing a few plant fragments

Preservation: concretion

Primary reference: I. Obata, Y. Kawashita, S. Maiya, Y. Taketani, M. Futakami and T. Suzuki. 1989. An Upper Cretaceous plesiosaur (Family Elasmosauridae) from the Wakkanai area Hokkaido. Bulletin of the National Science Museum, Series C: Geology, Tokyo 15(1):25-31 [J. Alroy/R. Whatley/M. Carrano] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 28177: authorized by John Alroy, entered by Erin Leckey on 27.01.2003

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)