Loc. 2.2, Sannai River [Tentokuji Fm]: Piacenzian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
1 specimen
Bivalvia - Protobranchia - Nuculidae
1 specimen
Acila sp. Adams and Adams 1858
1 specimen
4 specimens
8 specimens
2 specimens
Bivalvia - Protobranchia - Sareptidae
34 specimens
Bivalvia - Protobranchia - Malletiidae
17 specimens
Bivalvia - Protobranchia - Yoldiidae
Yoldia sp. Möller 1842
1 specimen
Bivalvia - Cardiida - Tellinidae
17 specimens
2 specimens
1 specimen
Bivalvia - Cardiida - Cardiidae
87 specimens
25 specimens
Bivalvia - Venerida - Veneridae
10 specimens
2 specimens
8 specimens
2 specimens
Bivalvia - Venerida - Ungulinidae
3 specimens
5 specimens
Bivalvia - Venerida - Mactridae
5 specimens
3 specimens
Bivalvia - Pandorida - Lyonsiidae
4 specimens
Bivalvia - Carditida - Astartidae
86 specimens
Bivalvia - Carditida - Carditidae
6 specimens
128 specimens
Megacardita sp. Sacco 1899
1 specimen
Bivalvia - Arcida - Limopsidae
7 specimens
Bivalvia - Arcida - Glycymerididae
100 specimens
3 specimens
Bivalvia - Arcida - Cucullaeidae
Arca boucardi Jousseaume 1894
1 specimen
Bivalvia - Arcida - Arcidae
12 specimens
Barbatia sp. Gray 1842
3 specimens
Bivalvia - Arcida - Parallelodontidae
3 specimens
Bivalvia - Pectinida - Pectinidae
14 specimens
Mizuhopecten sp. Masuda 1963
42 specimens
46 specimens
Chlamys (Chlamys) tamurae Masuda and Sawada 1961
1 specimen
2 specimens
Swiftopecten sp. Hertlein 1935
1 specimen
Bivalvia - Mytilida - Crenellidae
1 specimen
Gastropoda - Lepetellida - Fissurellidae
1 specimen
Gastropoda - Eucyclidae
Turcica sp. Adams 1854
1 specimen
Gastropoda - Solariellidae
Minolia sp. Adams 1860
3 specimens
Gastropoda - Turbinidae
17 specimens
Gastropoda - Trochidae
Umbonium sp. Link 1807
1 specimen
Gastropoda - Patellida - Acmaeidae
2 specimens
Gastropoda - Patellida - Lepetidae
1 specimen
Gastropoda - Littorinidae
Littorina sp. Ferussac 1821
1 specimen
Gastropoda - Neogastropoda - Conidae
Conidae indet. Fleming 1822
3 specimens
Gastropoda - Neogastropoda - Volutidae
2 specimens
Gastropoda - Neogastropoda - Olividae
Oliva mustelina Lamarck 1810
16 specimens
Gastropoda - Neogastropoda - Tudiclidae
Lirabuccinum sp. Vermej 1991
1 specimen
Gastropoda - Neogastropoda - Colubrariidae
Colubraria sp. Schumacher 1817
1 specimen
Gastropoda - Neogastropoda - Buccinidae
Buccinidae indet. Rafinesque 1815
1 specimen
2 specimens
1 specimen
Gastropoda - Ranellidae
8 specimens
Gastropoda - Cypraeidae
Erronea sp. Troschel 1863
1 specimen
Gastropoda - Naticidae
23 specimens
Glossaulax cf. vesicalis (Philippi 1848)
1 specimen
Gastropoda - Turritellidae
1 specimen
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 "lower" member of the formation, near the base of the section.
Lithology and environment
Primary lithology: poorly lithified sandstone
Secondary lithology: poorly lithified siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Alternating of siltstone and 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:97077
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2010-07-17 15:59:10 Last modified:2025-02-22 15:12:02
Access level:the public Released:2010-07-17 15:59:10
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]