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 Dactylioceras helanthoides 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
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 38195: authorized by Martin Aberhan, entered by Sabine Nürnberg on 19.04.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Cephalopoda | |
Dactylioceras helianthoides ammonite
Dactylioceras sp. Hyatt 1867 ammonite | |
Fuciniceras sp. Haas 1913 ammonite
Harpoceras chrysanthemum ammonite | |
Calliphylloceras sp. Spath 1927 ammonite |