Chichibu (Miocene to of Japan)

Where: Saitama, Japan (36.0° N, 139.1° E: paleocoordinates 39.5° N, 136.4° E)

• coordinate estimated from map

When: N8 foram zone, Nagura Formation (Chichibumachi Group), Burdigalian to Burdigalian (20.4 - 13.8 Ma)

• late Burdigalian-Langhian (16.4–15.1 Ma). The Nagura Formation forms the lowermost part of the Chichibumachi Group, which correlates with foraminiferal zone N8 [51, 110, 111] and thus spans the Burdigalian- Langhian boundary (16.4–15.1 Ma) [20, 54]. (Marx & Fordyce, 2015)

• formation-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithology not reported

• tropical, shallow, reef

Size class: macrofossils

Primary reference: T. Kimura and Y. Hasegawa. 2004. An outline of the Miocene cetotheres of Japan. Bulletin of the Gunma Museum of Natural History 8:79-88 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56956: authorized by Mark Uhen, entered by Mark Uhen on 29.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ornithurae - Pelagornithidae
Osteodontornis sp.1 Howard 1957 bird
 Perissodactyla - Paleoparadoxiidae
Paleoparadoxia tabatai2 Tokunaga 1939 desmostylian
 Mysticeti - Cetotheriidae
Cetotheriidae indet. Brandt 1872 whale
 Balaenopteroidea -
Diorocetus sp. Kellogg 1968 whale
new species
Diorocetus chichibuensis n. sp.3 Yoshida et al. 2003 whale