Where: Japan (36.3° N, 138.3° E: paleocoordinates 36.5° N, 138.2° E)
• coordinate stated in text
• outcrop-level geographic resolution
When: Ookui Formation, Calabrian (1.8 - 0.8 Ma)
• 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.
• bed-level stratigraphic resolution
Environment/lithology: terrestrial; unlithified, muddy sandstone
Size class: macrofossils
Collection methods: Repository: Osaka Museum of Natural History
Primary reference: 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]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 160539: authorized by Matthew Clapham, entered by Matthew Clapham on 24.08.2014
Creative Commons license: CC BY (attribution)
Taxonomic list
Insecta | |
Curculionidae indet. Latreille 1802 snout beetle
Lixus sp. Fabricius 1801 snout beetle | |
Plateumaris constricticollis Jacoby 1885 reed leaf beetle
Donacia sp. Fabricius 1775 leaf beetle | |
Hydrochara sp. Berthold 1827 water scavenger beetle
Coelostoma ? orbiculare Fabricius 1775 water scavenger beetle | |
Dytiscus sp. Linnaeus 1758 predaceous diving beetle
Ilybius sp. Erichson 1832 predaceous diving beetle
"Agabus ? optatus" = Platambus optatus Sharp 1884 predaceous diving beetle
Agabus sp. Leach 1817 predaceous diving beetle
Rhantus sp. Dejean 1833 predaceous diving beetle | |
Carabidae indet., Carabus sp., "Apotomopterus maacki" = Carabus (Apotomopterus) maacki, "Hemicarabus maeander" = Carabus (Homoeocarabus) maeander, Pterostichus cf. planicollis, Chlaenius spp., Chlaenius gebleri
Carabidae indet. Latreille 1802 ground beetle
Carabus sp. Linnaeus 1758 ground beetle
"Hemicarabus maeander" = Carabus (Homoeocarabus) maeander Fischer von Waldheim 1822 ground beetle OMF 940632-001, 950632-001
Pterostichus cf. planicollis ground beetle
Chlaenius spp. Bonelli 1810 ground beetle |