Meinohama, near Fukuoka (Oligocene of Japan)

Where: Japan (33.6° N, 130.3° E: paleocoordinates 40.0° N, 126.2° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Meinohama Group, Rupelian (33.9 - 28.1 Ma)

• The Meinohama Sandstone (or Formation, or Group) is correlative with the Kishima Group and the lowest part of the Ashiya Group. The Ashiya Group corresponds to Zones P21-"N4" of Blow's scale of planktonic foraminifera (Saito & Okada, 1984; Tsuchi et al., 1987) and Zones CP18-CP19b of calcareous nannoplankton (Okada & Bukry, 1980). The fission track age of the bottom of the Yamaga Formation is about 32 Ma (Ozaki & Hamasaki, 1991). Okada (1992) showed that the Yamaga and Sakamizu Formations were assigned to Zone CP19a (latest Rupelian-early Chattian) of calcareous nannoplankton. Miyachi & Sakai (1991) obtained fission track ages of 33.9 Ma for the Sari Formation, the second-lowest in the Kishima Group, consistent with nannoplankton biostratigraphy suggesting a CP16a zone for the underlying Kishima Formation (Okada, 1992). Together, the evidence suggests a Rupelian age for the Meinohama Group.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithified sandstone

• The roughly-correlative Yamaga Formation includes a range of environments from offshore, offshore-transition, and tide-influenced shoreface (Tomita & Oji, 2010). Similarly, the Kishima and Karatsu Formations to the south include offshore and offshore-transition environments (Yamaguchi et al., 2006). Without sedimentological information from the Meinohama site itself, assigning an environment more specific than "coastal" will not be possible.

Size class: macrofossils

Collected by T. Sumitomo, H. Yabe, T. Nagao

Primary reference: T. Nagao. 1926. Aturia yokoyamai, nov. nom., from the Palaeogene of Kyushu. Science Reports of the Tohoku Imperial University, 2nd Series, Geology 9:29-32 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 179888: authorized by Matthew Clapham, entered by Matthew Clapham on 03.07.2016, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Nautilida - Aturiidae
Aturia yokoyamai
Aturia yokoyamai Nagao 1926 nautiloid
Bivalvia
 Pholadida - Pholadidae
Parapholas satoi n. sp.
Parapholas satoi n. sp. Nagao 1928 clam