Loc. 3, Sannai River [Tentokuji Fm]: Piacenzian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Turritellidae
10 specimens
unclassified
1 specimen
1 specimen
Bivalvia - Protobranchia - Nuculidae
28 specimens
Bivalvia - Protobranchia - Nuculanidae
3 specimens
Bivalvia - Protobranchia - Yoldiidae
2 specimens
Bivalvia - Cardiida - Tellinidae
2 specimens
Bivalvia - Cardiida - Cardiidae
5 specimens
Bivalvia - Lucinida - Lucinidae
Lucinoma acutilineata (Conrad 1849)
9 specimens
Bivalvia - Venerida - Veneridae
1 specimen
4 specimens
12 specimens
Bivalvia - Thraciida - Thraciidae
1 specimen
Bivalvia - Carditida - Astartidae
4 specimens
17 specimens
Bivalvia - Carditida - Carditidae
25 specimens
1 specimen
Bivalvia - Arcida - Limopsidae
1 specimen
Bivalvia - Arcida - Glycymerididae
3 specimens
58 specimens
Bivalvia - Arcida - Arcidae
8 specimens
1 specimen
Bivalvia - Pectinida - Pectinidae
Mizuhopecten sp. Masuda 1963
7 specimens
Bivalvia - Mytilida - Mytilidae
Mytilus sp. Linnaeus 1758
3 specimens
Gastropoda - Neogastropoda - Pseudomelatomidae
1 specimen
Rectiplanes sp. Bartsch 1944
1 specimen
Brachytoma sp. Swainson 1840
1 specimen
Gastropoda - Neogastropoda - Borsoniidae
Ophiodermella sp. Bartsch 1944
1 specimen
Gastropoda - Neogastropoda - Colubrariidae
Colubraria sp. Schumacher 1817
1 specimen
Gastropoda - Neogastropoda - Buccinidae
1 specimen
Gastropoda - Cassidae
1 specimen
Gastropoda - Naticidae
Cryptonatica janthostoma (Deshayes 1839)
4 specimens
see common names

Geography
Country:Japan
Coordinates: 39.8° North, 140.4° East (view map)
Paleocoordinates:39.6° North, 139.8° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Neogene Epoch: Pliocene
Stage: Piacenzian 10 m.y. bin: Cenozoic 6
Key time interval: Piacenzian Nannofossil zone:  NN16
Age range of interval: 3.6 - 2.58 m.y. ago
Stratigraphy
Formation:Tentokuji
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Akita Fm, which overlie the Funakawa Fm, and is overlain by the Sasaoka Fm. AGE: Middle Pliocene, on the basis of foraminiferal and calcareous nanofossil biostratigraphy. Refined to Piacenzian on the basis of nannofossil biostratigraphy [A. Hendy, 6/2020]. STRATIGRAPHIC POSITION: From the "middle" member of the formation, near the middle of the section.
Lithology and environment
Primary lithology:fine poorly lithified sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Fine-grained sandstone. LITHIFICATION: Poorly-lithified, based on figured specimens.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Both cold- and warm-water species found. Shallow warm-water currents over the cold-water mass is suggested.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:bulk,field collection
Reason for describing collection:paleoecologic analysis
Collection method comments: COLLECTORS: Not stated in text, but presumably including K. Amano et al. REPOSITORY: Not stated in text. Possibly Joetsu University or Akita University.
Taxonomic list comments:COVERAGE: Exhaustive of mollusca. NOMENCLATURE: Not an authoritative publication, but with modern nomenclature and species-resolution identifications.
Metadata
Database number:97079
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2010-07-17 16:00:59 Last modified:2025-02-22 15:12:02
Access level:the public Released:2010-07-17 16:00:59
Creative Commons license:CC0
Reference information

Primary reference:
33142. K. Amano, M. Suzuki, and T. Sato. 2000. Warm-water influx into Japan Sea in the middle Pliocene - Molluscan faunas from the Tentokuji FOrmation around Mt. Taihei in Akita Prefecture. Journal of the Geological Society of Japan 106(4):299-306 [A. Hendy/A. Hendy]