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)