Toyora, Dactylioceras helianthoides zone, Locality (11) Era River D2 (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), Early/Lower Toarcian (183.0 - 182.0 Ma)

• Locality belongs to the Fontanelliceras fontanellense 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; shale

• Lower to Middle Jurassic shallow marine (partly brackish?) clastic deposits
• clayey 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 38194: authorized by Martin Aberhan, entered by Sabine Nürnberg on 19.04.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Ammonoida indet.
Cephalopoda
 Ammonitida - Hildoceratidae
Harpoceras chrysanthemum, Harpoceras inouyei, Fuciniceras sp.
Fuciniceras sp. Haas 1913 ammonite
 Ammonitida - Lytoceratidae
Lytoceras "sp. A"
Lytoceras "sp. A" Suess 1865 ammonite
sp. A