Fukagawa: Zanclean, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Osteichthyes
- Cetacea
- Balaenidae
|
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| 1 specimen | ||||||||||
| Balaenula sp HUES 10003 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan | State/province: | Hokkaido | County: | Fukagawa |
| Coordinates: | 43.7° North, 142.1° East (view map) | ||||
| Paleocoordinates: | 43.5° North, 140.9° East (Wright 2013) | ||||
| Basis of coordinate: | estimated from map |
Time
| Period: | Neogene | Epoch: | Pliocene |
| Stage: | Zanclean | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Zanclean | ||
| Age range of interval: | 5.333 - 3.6 m.y. ago | ||
| Age estimate: | minimum 4.1 ± 0.6 Ma (fission track) |
Stratigraphy
| Geological group: | Fukagawa | Formation: | Chichibubetsu | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: early Pliocene; a.k.a. Chichibubetsu Formation
The Chippubetsu Formation, which forms part of the Fukagawa Group exposed in Hokkaido, Japan [80]. The specimen was found in a horizon below a tuff level (“T2”) likely correlative with the S1 tuff of the Takikawa Formation [81], which has been dated to 4.1 ± 0.6 Ma based on fission-track dating [82]. The age of the base of the Chippubetsu Formation is currently unknown. However, the lower part of this formation has been correlated with the upper part of the Horokaoshirarika Formation based on palynological data [80], with the latter falling into the Neodenticula kamtschatica diatom zone [83], dated to ca. 6.4–3.5 Ma [84]. Together, these estimates imply an approximate age range of 6.4–4.1 Ma. (Marx & Fordyce, 2015) | |||||
Lithology and environment
| Primary lithology: | not reported |
| Environment: | transition zone/lower shoreface |
| Geology comments: transitional to beach, regression | |
Taphonomy
| Modes of preservation: | body,original phosphate |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | general faunal/floral analysis |
Metadata
| Database number: | 97629 | ||
| Authorizer: | M. Uhen | Enterer: | M. Uhen |
| Modifier: | P. Wagner | Research group: | vertebrate |
| Created: | 2010-08-16 08:45:18 | Last modified: | 2025-11-11 13:55:10 |
| Access level: | the public | Released: | 2010-08-16 08:45:18 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 33319. | T. Kimura. 2009. Review of the fossil balaenids from Japan with a re-description of Eubalaena shinshuensis (Mammalia, Cetacea, Mysticeti). Quaderni del Museo di Storia Naturale di Livorno 22:3-21 [M. Uhen/M. Uhen] |
Secondary references:
| 55050 | F. G. Marx and R. E. Fordyce. 2015. Baleen boom and bust: a synthesis of mysticete phylogeny, diversity and disparity. Royal Society Open Science 2:140434 [M. Uhen/M. Uhen] |