Annakka: Tortonian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Kobayashi 2002 1 specimen
Shimoakima specimen
Furusawa 2005
Osteichthyes - Cetacea - Delphinidae
Oishi and Hasegawa 1995 1 specimen
Osteichthyes - Cetacea
Kimura et al. 2006
Osteichthyes - Cetacea - Balaenopteridae
Hasegawa et al. 2002 1 specimen
more likely Balaenopteridae indet. (M. D. Uhen)
Osteichthyes - Cetacea
1 specimen
Osteichthyes - Carnivora - Desmatophocidae
Hasegawa et al. 2000 1 specimen
Osteichthyes - Anseriformes - Anatidae
Matsuoka et al. 2001 1 specimen
see common names

Geography
Country:Japan State/province:Gunma
Coordinates: 36.3° North, 138.9° East (view map)
Paleocoordinates:35.9° North, 137.1° East (Wright 2013)
Basis of coordinate:estimated from map
Time
Period: Neogene Epoch: Miocene
Stage: Tortonian 10 m.y. bin: Cenozoic 6
Key time interval: Tortonian
Age range of interval: 11.63 - 7.246 m.y. ago
Age estimate: 11.29 ± .12 Ma (Ar/Ar)
Stratigraphy
Geological group:Tomioka Formation:Haraichi
Stratigraphic resolution:group of beds
Stratigraphy comments: Hasegawa and Kimura (2008) place this at about 11.29 Ma based on ash dates.
Kimura et al. (20006) state that this locality is approximately 11.5 Ma, which makes it late Serravalian.
Lithology and environment
Primary lithology: not reported
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Also known as:Annaka
Database number:56950
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:M. Uhen Research group:vertebrate
Created:2005-11-29 11:38:53 Last modified:2025-02-22 15:12:02
Access level:the public Released:2005-11-29 11:38:53
Creative Commons license:CC0
Reference information

Primary reference:
15356. 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]

Secondary references:

70357 H. Furusawa. 2005. Evolution of the North Pacific Sirenia (Hydrodamalinae) and their paleoenvironment. Fossils 77:29-33 [M. Uhen/M. Uhen]
25587 Y. Hasegawa, Y. Takakuwa, H. Nakajima and H. Matsuoka. 2000. Miocene Otariid (Allodesminae) scapula from Haraichi Formation, Tomioka Group, Gunma, Japan. Bulletin of the Gunma Museum of Natural History 4:47-56 [M. Uhen/M. Uhen]
19064 Y. Hasegawa, Y. Takakuwa, and H. Nakajima. 2001. First discovery of Physeterid fossil from the Haraichi Formation (Middle Miocene), Tomioka Group, Gunma, Japan. Bulletin of the Gunmna Museum of Natural History 5:31-38 [M. Uhen/M. Uhen]
25584 Y. Hasegawa, Y. Takakuwa, and H. Nakajima. 2002. A balaenopterid whale from the Haraichi Formation (Middle Miocene), Toioka Group, Annaka City, Gunma Prefecture, Japan. Bulletin of the Gunma Museum of Natural History 6:39-44 [M. Uhen/M. Uhen/M. Uhen]
19039 T. Kimura, Y. Hasegawa, and L. G. Barnes. 2006. Fossil sperm whales (Cetacea, Physeteridae) from Gunma and Ibaraki prefectures, Japan; with observations on the Miocene fossil sperm whale Scaldicetus shigensis Hirota and Barnes, 1995. Bulletin of the Gunma Museum of Natural History 10:1-23 [M. Uhen/M. Uhen]
27097 S. Kobayashi. 2002. Halitheriine sirenia from the Itahana Formation (late Middel Miocene - early late Miocene) in Annaka, Gunma Prefecture, central Japan. Chikyu Kagaku 56:179-190 [M. Uhen/M. Uhen]
25588 H. Matsuoka, H. Nakajima, Y. Takakuwa and Y. Hasegawa. 2001. Preliminary note on the Miocene flightless swan from the Haraichi Formation, Tomioka Group of Annaka, Gunma, Japan. Bulletin of the Gunma Museum of Natural History 5:1-8 [M. Uhen/M. Uhen]
12148 M. Oishi and Y. Hasegawa. 1995. A list of fossil cetaceans in Japan. The Island Arc 3:493-505 [M. Uhen/M. Uhen/M. Uhen]