Loc. 3, Sannai River [Tentokuji Fm] (Pliocene of Japan)

Where: Japan (39.8° N, 140.4° E: paleocoordinates 40.3° N, 139.8° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: NN16 nannofossil zone, Tentokuji Formation, Piacenzian (3.6 - 2.6 Ma)

• 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.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, fine-grained sandstone

• ENVIRONMENT: Both cold- and warm-water species found. Shallow warm-water currents over the cold-water mass is suggested.
• SPECIFIC LITHOLOGY: Fine-grained sandstone. LITHIFICATION: Poorly-lithified, based on figured specimens.

Size class: macrofossils

Collection methods: bulk,

• COLLECTORS: Not stated in text, but presumably including K. Amano et al. REPOSITORY: Not stated in text. Possibly Joetsu University or Akita University.

Primary reference: 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]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 97079: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive of mollusca. NOMENCLATURE: Not an authoritative publication, but with modern nomenclature and species-resolution identifications.
unclassified
  -
Gastropoda
 Cerithioidea - Turritellidae
Turritella (Neohaustator) saushuensis turret shell
SUBSPECIES: Turritella (Neohaustator) saushuensis motidukii
 Pseudomelanoidea - Pseudomelaniidae
"Antiplanes contraria" = Antiplanes, "Rectiplanes sp." = Antiplanes
"Antiplanes contraria" = Antiplanes snail
"Rectiplanes sp." = Antiplanes snail
 Neogastropoda - Buccinidae
Buccinum sp. Linnaeus 1758 true whelk
Colubraria sp. Schumacher 1817 true whelk
 Neogastropoda - Turridae
Brachytoma sp. Swainson 1840 turrid
Ophiodermella sp. Bartsch 1944 turrid
 Sorbeoconcha - Cassidae
 Sorbeoconcha - Naticidae
Cryptonatica janthostoma Deshayes 1839 moon snail
Bivalvia
 Arcida - Arcidae
"Arca (Scapharca) sp." = Scapharca, Anadara (Anadara) amicula
"Arca (Scapharca) sp." = Scapharca Gray 1847 clam
 Arcida - Glycymerididae
 Arcida - Limopsidae
 Pectinida - Pectinoidae
Mizuhopecten sp. Masuda 1963 scallop
 Mytilida - Mytilidae
Mytilus sp. Linnaeus 1758 mussel
 Lucinida - Lucinidae
Lucinoma acutilineata Conrad 1849 clam
 Thraciida - Thraciidae
 Cardiida - Veneridae
"Phacosoma tomikawensis" = Dosinia (Phacosoma) venus clam
 Cardiida - Cardiidae
Clinocardium sp. Keen 1936 cockle
 Cardiida - Tellinidae
 Carditida - Astartidae
Astarte hakodatensis, "Tridonta (Tridonta) borealis" = Astarte borealis
"Tridonta (Tridonta) borealis" = Astarte borealis Chemnitz 1784 clam
 Carditida - Carditidae
 Nuculida - Nuculidae
Acila (Truncacila) insignis divaricate nutclam
 Nuculanida - Nuculanidae
Saccella sematensis pointed nut clam
 Nuculanida - Yoldiidae