Where: Yamaguchi, Japan (34.3° N, 131.0° E: paleocoordinates 44.9° N, 138.7° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Na Member (Nishinakayama Formation), Tenuicostatum (183.0 - 182.0 Ma)

• Locality belongs to the Fontanelliceras fontanellense zone = lowermost Toarcian according to revisions of Nakada and Matsuoka (2008, 2011). The Nishinakayama Fm attains about 300m in maximum thickness, and is lithostratigraphically subdivided into three members, namely Na (tuffaceous silty shales; 90m thick), Nb and Nc in upward sequence.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; tuffaceous, silty shale

Size class: macrofossils

Primary reference: K. Tanabe. 1991. Early Jurrasic Macrofauna of the Oxygen-Depleted Epicontinental Marin Basin in the Toyora Area, West Japan. Saito Ho-on Kai Special Publication 3:147-161 [M. Aberhan/S. Nurnberg/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 38173: authorized by Martin Aberhan, entered by Sabine Nürnberg on 18.04.2004

Creative Commons license: CC BY (attribution)