Toyora, Fontanelliceras fontanellense zone, Locality 2 (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: 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

• 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 38173: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 18.04.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Myalinida - Inoceramidae
 Pectinida - Propeamussiidae
Parvamussium sp. Sacco 1897 mud scallop
 Pectinida - Oxytomidae
Meleagrinella sp. Whitfield 1855 scallop
 Ostreida - Posidoniidae
Cephalopoda
 Ammonoidea -
Ammonoidea indet. Zittel 1884 ammonite
 Ammonitida -
Ammonitina indet. Hyatt 1889 ammonite
Aptychi (isolated)
 Ammonitida - Hildoceratidae
"Paltarpites toyoranus" = Protogrammoceras, Fuciniceras sp.
"Paltarpites toyoranus" = Protogrammoceras ammonite
Fuciniceras sp. Haas 1913 ammonite
 Ammonitida - Lytoceratidae
Lytoceras "sp. A" Suess 1865 ammonite
sp. A
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily