Hakeyama, Kitamimaki-mura, Kitasaku-gun: Calabrian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Insecta - Coleoptera - Hydrophilidae
1 specimen
3 specimens
Insecta - Coleoptera - Chrysomelidae
1 specimen
27 specimens
Insecta - Coleoptera - Curculionidae
2 specimens
3 specimens
Insecta - Coleoptera - Dytiscidae
2 specimens
Agabus ? optatus Sharp 1884
1 specimen
7 specimens
Ilybius sp. Erichson 1832
6 specimens
Rhantus sp. Dejean 1833
1 specimen
Insecta - Coleoptera - Carabidae
11 specimens
3 specimens
3 specimens
Chlaenius gebleri Ganglbauer 1891
1 specimen
OMF 951106-001
1 specimen
Apotomopterus maacki (Morawitz 1862)
1 specimen
OMF 970314-001
Hemicarabus maeander (Fischer von Waldheim 1822)
2 specimens
OMF 940632-001, 950632-001
see common names

Geography
Country:Japan
Coordinates: 36.3° North, 138.3° East (view map)
Paleocoordinates:36.3° North, 138.2° East (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Quaternary Epoch: Pleistocene
Stage: Calabrian 10 m.y. bin: Cenozoic 6
Key time interval: Calabrian
Age range of interval: 1.8 - 0.774 m.y. ago
Stratigraphy
Formation:Ookui
Stratigraphic resolution:bed
Stratigraphy comments: About 70 cm below the Hakeyama tuff (dated by fission track at 1.3 +/- 0.3 Ma). The age of the Upper member of the Ookui Formation is assigned to Early Pleistocene based on: (1) K-Ar age of the overlying Nunobikikannon Formation shows 1.4±0.6 Ma (Yamagishi and Kosaka, 1991). (2) K-Ar age of the uppermost formation of the Yachiho Group shows 1.17±0.05 Ma (Kaneoka and Kawachi, 1983). (3) The lowest formation of the Yachiho Group is correlated with the Matuyama Reversed Epoch older than Jaramillo event, based on paleomagnetization of volcanic rocks (Kondo, 1988). (4) Fossils of Stegodon aurorae reported the Upper member of the Ookui Formation and the lowest formation of the Yachiho Group.
Lithology and environment
Primary lithology: unlithified muddy sandstone
Lithology description: Poorly sorted muddy sand and gravel
Environment:terrestrial indet. Tectonic setting:intramontane basin
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Collection method comments: Repository: Osaka Museum of Natural History
Metadata
Database number:160539
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:paleoentomology
Created:2014-08-24 11:33:56 Last modified:2025-02-22 15:12:02
Access level:the public Released:2014-08-24 11:33:56
Creative Commons license:CC0
Reference information

Primary reference:
52399. M. Hayashi. 1998. Early Pleistocene ground beetles (Coleoptera: Carabidae) from the Ookui Formation in Nagano Prefecture, central Japan, and their biogeographical and paleoenvironmental significance. The Quaternary Research 37:117-129 [M. Clapham/M. Clapham]