Meinohama, near Fukuoka: Rupelian, Japan
collected by T. Sumitomo, H. Yabe, T. Nagao

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Nautilida - Aturiidae
Bivalvia - Pholadida - Pholadidae
Nagao 1928
see common names

Geography
Country:Japan
Coordinates: 33.6° North, 130.3° East (view map)
Paleocoordinates:36.0° North, 127.2° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Oligocene
Stage: Rupelian 10 m.y. bin: Cenozoic 4
Key time interval: Rupelian
Age range of interval: 33.9 - 27.3 m.y. ago
Stratigraphy
Geological group:Meinohama
Stratigraphic resolution:group of beds
Stratigraphy comments: 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.
Lithology and environment
Primary lithology: lithified sandstone
Environment:coastal indet.
Geology comments: 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.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collectors:T. Sumitomo, H. Yabe, T. Nagao
Metadata
Database number:179888
Authorizer:M. Clapham, M. Uhen Enterer:M. Clapham, M. Uhen
Modifier:M. Clapham Research group:marine invertebrate
Created:2016-07-03 18:03:17 Last modified:2025-02-22 15:12:02
Access level:the public Released:2016-07-03 18:03:17
Creative Commons license:CC0
Reference information

Primary reference:
59678. 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]

Secondary references:

61666 T. Nagao. 1928. Palaeogene fossils of the Island of Kyushu, Japan Part II. Science Reports of the Tohoku Imperial University 12(1):11-140 [M. Uhen/B. Shipps/M. Uhen]