Toyora, Fontanelliceras fontanellense zone, Locality (7) Sakuraguchidani V. 10a (Jurassic of Japan)

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: Nb 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, 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 38171: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 17.04.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ammonitida - Hildoceratidae
Fontanelliceras fontanellense Gemmellaro 1885 ammonite
 Ammonitida - Lytoceratidae
Lytoceras "sp. A" Suess 1865 ammonite
sp. A