Ykw-01, Koyasawa River (Miocene of Japan)

Where: Yamagata, Japan (37.9° N, 140.0° E: paleocoordinates 39.0° N, 138.8° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Takamine Formation, Messinian (7.2 - 5.3 Ma)

• Lower Takamine Formation, uppermost Miocene (younger than 5.9 +/1 1.2 Ma).

• bed-level stratigraphic resolution

Environment/lithology: mire or swamp; poorly lithified, carbonaceous siltstone

• Formation composed of meandering river and marsh deposits (peaty silt presumably reflects overbank environment). Intra-arc basin.
• Peaty silt

Size class: macrofossils

Collection methods: Repository: Osaka Museum of Natural History (OMNH)

Primary reference: M. Hayashi. 2001. Neogene donaciine fossils from Tamaniwa district, Yamagata Prefecture, Japan, with description of a new species (Coleoptera: Chrysomelidae: Donaciinae). Bulletin of the Osaka Museum of Natural History 55:7-14 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 156204: authorized by Matthew Clapham, entered by Matthew Clapham on 12.05.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Insecta
 Coleoptera - Chrysomelidae
Plateumaris kinugasana n. sp., Donacia (Donaciomima) sp.
Plateumaris kinugasana n. sp. Hayashi 2001 reed leaf beetle
OMNH TI-130 and 7 paratypes
Donacia (Donaciomima) sp. Medvedev 1973 leaf beetle