Loc. 2.2, 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 "lower" member of the formation, near the base of the section.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified sandstone and poorly lithified siltstone

• ENVIRONMENT: Both cold- and warm-water species found. Shallow warm-water currents over the cold-water mass is suggested.
• SPECIFIC LITHOLOGY: Alternating of siltstone and 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 97077: 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
  -
Bivalvia
 Mytilida - Crenellidae
 Pectinida - Pectinoidae
Mizuhopecten sp. Masuda 1963 scallop
Chlamys (Chlamys) cosibensis Yokoyama 1911 scallop
"Swiftopecten sp." = Chlamys (Swiftopecten) Hertlein 1935 scallop
Chlamys (Chlamys) tamurae Masuda and Sawada 1961 scallop
 Arcida - Glycymerididae
 Arcida - Parallelodontidae
 Arcida - Cucullaeidae
"Arca boucardi" = Tetrarca boucardi
"Arca boucardi" = Tetrarca boucardi Jousseaume 1894 clam
 Arcida - Arcidae
 Arcida - Limopsidae
 Carditida - Carditidae
 Carditida - Astartidae
"Tridonta (Tridonta) borealis" = Astarte borealis
"Tridonta (Tridonta) borealis" = Astarte borealis Chemnitz 1784 clam
 Cardiida - Tellinidae
"Cadella lubrica" = Tellina (Cadella) tellin clam
Macoma (Macoma) calcarea Gmelin 1792 tellin clam
 Cardiida - Cardiidae
 Cardiida - Veneridae
"Phacosoma tomikawensis" = Dosinia (Phacosoma) venus clam
 Cardiida - Ungulinidae
Cycladicama cumingii, "Felaniella usta" = Diplodonta
"Felaniella usta" = Diplodonta clam
 Cardiida - Mactridae
"Spisula (Mactromeris) grayana" = Mactromeris, "Spisula (Mactromeris) voyi" = Mactromeris polynyma
"Spisula (Mactromeris) grayana" = Mactromeris clam
"Spisula (Mactromeris) voyi" = Mactromeris polynyma Stimpson 1860 clam
 Nuculida - Nuculidae
Acila sp. Adams and Adams 1858 divaricate nutclam
Acila (Acila) divaricata Hinds 1843 divaricate nutclam
Acila (Truncacila) insignis divaricate nutclam
Acila (Truncacila) aff. castrensis Hinds 1843 divaricate nutclam
 Nuculanida - Malletiidae
 Nuculanida - Sareptidae
"Portlandia (Portlandella) japonica" = Megayoldia (Portlandella)
"Portlandia (Portlandella) japonica" = Megayoldia (Portlandella) clam
 Nuculanida - Yoldiidae
Yoldia sp. Möller 1842 clam
Gastropoda
 Patellida - Lottiidae
 Patellida - Lepetidae
 Sorbeoconcha - Littorinidae
Littorina sp. Ferussac 1821 periwinkle
 Sorbeoconcha - Naticidae
Glossaulax cf. vesicalis Philippi 1848 moon snail
 Sorbeoconcha - Cypraeidae
Erronea sp. Troschel 1863 cowry
 Sorbeoconcha - Ranellidae
 Neogastropoda - Olividae
"Oliva mustelina" = Oliva (Neocylindrus) mustelina
"Oliva mustelina" = Oliva (Neocylindrus) mustelina Lamarck 1810 olive snail
 Neogastropoda - Siphonaliidae
Lirabuccinum sp. Vermej 1991 snail
 Neogastropoda - Buccinidae
Buccinidae indet. Rafinesque 1815 true whelk
Buccinum sp. Linnaeus 1758 true whelk
Colubraria sp. Schumacher 1817 true whelk
 Neogastropoda - Conidae
Conidae indet. Fleming 1822 cone shell
 Neogastropoda - Volutidae
 Cerithioidea - Turritellidae
 Lepetellida - Fissurellidae
 Trochoidea - Solariellidae
Minolia sp. Adams 1860 snail
 Trochoidea - Turbinidae
 Trochoidea - Trochidae
Umbonium sp. Link 1807 top snail
 Seguenzioidea - Eucyclidae
Turcica sp. Adams 1854 snail