Toyora, Protogrammoceras nipponicum zone, Locality (11) Era River A1 (Jurassic to of Japan)

Where: Yamaguchi, Japan (34.3° N, 131.0° E: paleocoordinates 45.7° N, 139.2° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Nb Member (Nishinakayama Formation), Late/Upper Pliensbachian to Late/Upper Pliensbachian (189.6 - 182.0 Ma)

• Locality belongs to the Protogrammoceras nipponicum zone. The Nishinakayama Fm attains about 300m in maximum thickness, and is lithostratigraphically subdivided into three members, namely Na, Nb (black shales with intercalations of fine sandstone; 160m thick), and Nc in upward sequence.

• bed-level stratigraphic resolution

Environment/lithology: marine; silty shale

• Lower to Middle Jurassic shallow marine (partly brackish?) clastic deposits

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 38175: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 18.04.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Myalinida - Inoceramidae
 Ammonitida - Hildoceratidae
Protogrammoceras sp. Spath 1913 ammonite
Lioceratoides sp. Spath 1919 ammonite
Fuciniceras sp. Haas 1913 ammonite
 Ammonitida - Dactylioceratidae