Loc. 21, Koguro River [Tentokuji Fm]: Pliocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Protobranchia - Nuculidae
208 specimens
Bivalvia - Pectinida - Pectinidae
Mizuhopecten sp. Masuda 1963
1 specimen
Bivalvia - Pectinida - Anomiidae
3 specimens
Bivalvia - Arcida - Arcidae
26 specimens
unclassified
35 specimens
722 specimens
Bivalvia - Arcida - Arcidae
1 specimen
Bivalvia - Pholadida - Corbulidae
1 specimen
Bivalvia - Thraciida - Myochamidae
1 specimen
Bivalvia - Lucinida - Lucinidae
Lucinoma annulata (Reeve 1850)
2 specimens
Bivalvia - Venerida - Mactridae
4 specimens
Bivalvia - Venerida - Veneridae
Callista chinensis (Holten 1802)
4 specimens
8 specimens
1 specimen
38 specimens
20 specimens
57 specimens
1 specimen
Bivalvia - Venerida - Ungulinidae
15 specimens
Bivalvia - Cardiida - Tellinidae
13 specimens
Bivalvia - Cardiida - Cardiidae
29 specimens
19 specimens
Gastropoda - Trochidae
184 specimens
Gastropoda - Lepetellida - Fissurellidae
1 specimen
Gastropoda - Opisthobranchiata - Cylichnidae
3 specimens
Gastropoda - Opisthobranchiata - Retusidae
Retusa sp. Brown 1827
1 specimen
Gastropoda - Cerithiidae
31 specimens
Gastropoda - Turritellidae
12 specimens
Gastropoda - Neogastropoda - Nassariidae
7 specimens
34 specimens
Gastropoda - Neogastropoda - Buccinidae
1 specimen
Neptunea sp. Röding 1798
1 specimen
1 specimen
11 specimens
1 specimen
10 specimens
Mohnia sp. Friele 1878
3 specimens
Gastropoda - Neogastropoda - Terebridae
2 specimens
Punctoterebra sp. Bartsch 1923
2 specimens
Gastropoda - Neogastropoda - Borsoniidae
1 specimen
38 specimens
14 specimens
Gastropoda - Neogastropoda - Mangeliidae
3 specimens
Oenopota sp. Mörch 1852
1 specimen
2 specimens
Nematoma sp. Bartsch 1941
2 specimens
Gastropoda - Neogastropoda - Pseudomelatomidae
2 specimens
Gastropoda - Neogastropoda - Cancellariidae
11 specimens
Gastropoda - Neogastropoda
5 specimens
Gastropoda - Neogastropoda - Olividae
3 specimens
Gastropoda - Littorinidae
1 specimen
Gastropoda - Naticidae
Glossaulax didyma (Röding 1798)
26 specimens
Mammilla sp. Schumacher 1817
4 specimens
57 specimens
Cryptonatica janthostoma (Deshayes 1839)
48 specimens
Gastropoda - Heterostropha - Acteonidae
2 specimens
Gastropoda - Heterostropha - Pyramidellidae
Turbonilla sp. Risso 1826
1 specimen
Syrnola sp. Adams 1860
1 specimen
Gastropoda - Heterostropha - Amathinidae
Leucotina sp. Adams 1860
3 specimens
see common names

Geography
Country:Japan
Coordinates: 39.8° North, 140.4° East (view map)
Paleocoordinates:39.6° North, 139.5° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period: Neogene Epoch: Pliocene
10 m.y. bin: Cenozoic 6
Key time interval: Pliocene Nannofossil zone:  NN16
Age range of interval: 5.333 - 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. STRATIGRAPHIC POSITION: From the "middle" member of the formation, near the top of the section.
Lithology and environment
Primary lithology:fine poorly lithified sandstone
Secondary lithology:fine poorly lithified sandstone
Includes fossils?Y
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Fine-grained siltstone. 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:97111
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2010-07-17 18:09:57 Last modified:2025-02-22 15:12:02
Access level:the public Released:2010-07-17 18:09:56
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]