Yamanokami, Hoshuyama-mura, Asakura coal-field (Oligocene of Japan)

Where: Japan (33.4° N, 130.7° E: paleocoordinates 39.9° N, 126.6° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ashiya Group, Rupelian (33.9 - 28.1 Ma)

• Lowest part of the Ashiya Group. Lower Ashiya Group is early Oligocene (CP18 nannoplankton zone) according to Ozaki et al. (1993).

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified sandstone

Size class: macrofossils

Collected by M. Kato, T. Nagao

Primary reference: S. Shimizu. 1926. On two species of Nautiloidea from the Tertiary of Japan. Science Reports of the Tohoku Imperial University, 2nd Series, Geology 9:25-27 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 179892: authorized by Matthew Clapham, entered by Matthew Clapham on 03.07.2016, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Ostreida - Pinnidae
Pinna asakuraensis n. sp.2 Nagao 1928 oyster
 Arcida - Noetiidae
Arca (Noetia) pondaungensis2 Nagao 1928 clam
var. transversa
 Hiatellida - Hiatellidae
Glycimeris altoumbonata n. sp.2 Nagao 1928 clam
Gastropoda
 Neogastropoda - Volutidae
? Volutilithes sp.2 Swainson 1829 volute
 Sorbeoconcha - Cassidae
? Galeodea sp.2 Link 1807 snail
Cephalopoda
 Nautilida - Nautilidae
"Nautilus japonicus n. sp." = Eutrephoceras japonicus
"Nautilus japonicus n. sp." = Eutrephoceras japonicus Shimizu 1926 nautiloid
 Nautilida - Aturiidae
Aturia yokoyamai1 Nagao 1926 nautiloid