Locality A - Hikoshima Nishiyama-cho (Ashiya Gp) (Oligocene of Japan)

Where: Yamaguchi, Japan (34.0° N, 130.9° E: paleocoordinates 39.2° N, 127.4° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ashiya Group, Late/Upper Oligocene (28.4 - 23.0 Ma)

• No stratigraphic data available as manuscript is in Japanese.

• bed-level stratigraphic resolution

Environment/lithology: coastal; sandstone

• Sedimentary facies and molluscan assemblages suggest an environment in the upper euneritic zone of a temperate to subtropical sea.
• The Ashiya Group is characterised by a sandstone-dominant shallw marine sequence (about 150 m thick), in which sedimentary facies include cross-stratified sandstone, parallel stratified sandstone, bioturbated sandstone, and sandstone/siltstone couplet facies.

Size class: macrofossils

Collection methods: bulk, quarrying,

• No collection data available as manuscript is in Japanese. Material is reposited in the Dept of Earth and Planetary Sciences, Faculty of Science, Kyushu University, and in Shimonoseki City Archaeological Museum, Shimonoseki.

Primary reference: K. Okamoto and T. Sakai. 1995. Sedimentary facies and fossil molluscs of the Oligocene Ashiya Group in the Hikoshima Takenokojim and Nishiyama area, Shimonoseki City, Southwest Japan. Bulletin of the Mizunami Fossil Museum 22:19-50 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 51446: authorized by Austin Hendy, entered by Austin Hendy on 05.06.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Taxonomic list is exhaustive for mollusca and includes other groups (Penguins, Sharks etc). Nomenclature is of a high quality. List is reprinted from Hirayama (1956)
Show authors, comments, and common names
Bivalvia
 Nuculida - Nuculidae
Acila aff. ashiyaensis
Acila aff. ashiyaensis divaricate nutclam
 Carditida - Carditidae
? Venericardia sp.
? Venericardia sp. Lamarck 1801 clam
 Carditida - Crassatellidae
"Eucrassatella yabei" = Crassatellites yabei
"Eucrassatella yabei" = Crassatellites yabei Nagao 1928 clam
 Solenida - Solenidae
Solen connectens
 Cardiida - Mactridae
Spisula sorachiensis
Spisula sorachiensis Otatsume 1933 clam
 Cardiida - Ungulinidae
Felaniella confusa
Felaniella confusa Nagao 1928 clam
 Cardiida - Veneridae
Macrocallista hanzawai, Macrocallista cf. matsuraensis, Pitar ashiyaensis, "Dosinia (Phacosoma) chikuzenensis" = Dosinia nomurai, "Pitar matsumotoi" = Pitaria matsumotoi
Macrocallista hanzawai Nagao 1928 venus clam
Macrocallista cf. matsuraensis Nagao 1928 venus clam
Pitar ashiyaensis venus clam
"Dosinia (Phacosoma) chikuzenensis" = Dosinia nomurai Otuka 1934 venus clam
"Pitar matsumotoi" = Pitaria matsumotoi Nagao 1928 venus clam
 Lucinida - Lucinidae
"Lucinoma acutilineatum" = Lucinoma acutilineata
"Lucinoma acutilineatum" = Lucinoma acutilineata Conrad 1849 clam
 Arcida - Glycymerididae
Glycymeris (Veletuceta) cisshuensis
Gastropoda
 Sorbeoconcha - Perissityidae
Siphonalia shojii, "Nassarius" sp.
Siphonalia shojii Hirayama 1956 true whelk
"Nassarius" sp. Duméril 1806 true whelk
 Caenogastropoda - Fasciolariidae
"Euspira ashiyaensis" = Euspira meisensis, Polinices sp.
"Euspira ashiyaensis" = Euspira meisensis Makiyama 1926 moon snail
Polinices sp. Monfort 1810 moon snail