Toyora, Fontanelliceras fontanellense zone, Locality 2: Tenuicostatum, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda
3 individuals
Cephalopoda - Ammonitida
Ammonitina indet. Hyatt 1889
3 individuals
Aptychi (isolated)
Cephalopoda - Ammonitida - Hildoceratidae
Fuciniceras sp. Haas 1913
1 individual
2 individuals
Cephalopoda - Ammonitida - Lytoceratidae
1 individual
sp. A
Bivalvia - Myalinida - Inoceramidae
2 individuals
Bivalvia - Ostreida - Posidoniidae
18 individuals
sp. A
35 individuals
Bivalvia - Pectinida - Oxytomidae
Meleagrinella sp. Whitfield 1855
1 individual
Bivalvia - Pectinida - Propeamussiidae
Parvamussium sp. (Sacco 1897)
109 individuals
Crinoidea
Crinoidea indet. Miller 1821
3 individuals
see common names

Geography
Country:Japan State/province:Yamaguchi
Coordinates: 34.3° North, 131.0° East (view map)
Paleocoordinates:45.2° North, 155.7° East (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period: Jurassic Epoch: Early Jurassic
Stage: Toarcian 10 m.y. bin: Jurassic 3
Key time interval: Tenuicostatum
Age range of interval: 184.2 - 182.9 m.y. ago
Stratigraphy
Geological group:Toyora Formation:Nishinakayama Member:Na
Stratigraphic resolution:group of beds
Stratigraphy comments: 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.
Lithology and environment
Primary lithology:tuffaceous silty "shale"
Environment:marine indet.
Geology comments: Lower to Middle Jurassic shallow marine (partly brackish?) clastic deposits
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Collection size:176 individuals
Reason for describing collection:paleoecologic analysis
Metadata
Database number:38173
Authorizer:M. Aberhan Enterer:S. Nurnberg
Modifier:M. Clapham Research group:marine invertebrate
Created:2004-04-18 01:37:12 Last modified:2025-02-22 15:12:02
Access level:the public Released:2004-04-18 01:37:12
Creative Commons license:CC0
Reference information

Primary reference:
10253. 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]