Atagoyama Quarry, Meinohama: Rupelian, Japan
collected by Matsushita
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Chondrichthyes
- Lamniformes
- Lamnidae
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Carcharodon aff. turgidus
(Agassiz 1839)
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| MISSPELT as Charcarodon | ||||||||||
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Rhynchonellata
- Terebratulida
- Terebratulidae
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Terebratula sp.
Müller 1776
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Bivalvia
- Carditida
- Crassatellidae
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Crassatellites yabei
Nagao 1928
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Bivalvia
- Carditida
- Carditidae
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Venericardia subnipponica
Nagao 1928
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| recombined as Venericardia (Venericor) subnipponica | ||||||||||
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Bivalvia
- Cardiida
- Veneridae
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Pitaria kyushuensis
Nagao 1928
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Callista hanzawai
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Cephalopoda
- Nautilida
- Nautilidae
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Neocymatoceras tsukushiense
Kobayashi 1954
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1 specimen | |||||||||
| recombined as Cymatoceras tsukushiense | ||||||||||
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Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium ashiyaensis
Nagao 1928
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| see common names | ||||||||||
Geography
| Country: | Japan |
| Coordinates: | 33.6° North, 130.3° East (view map) |
| Paleocoordinates: | 40.0° North, 126.2° East |
| 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: | 33.90000 - 27.82000 m.y. ago |
Stratigraphy
| Geological group: | Meinohama | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Meinohama Sandstone, at the base of the Ashiya Group. AGE: Oligocene. Early Tsukushian local stage. 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. STRATIGRAPHIC POSITION: From unknown position within formation. | |||||
Lithology and environment
| Primary lithology: | lithified sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Sandstone. LITHIFICATION: Lithified on the basis of figured specimens. | |
| 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: | mold/impression |
| Size of fossils: | macrofossils |
| Fragmentation: | occasional |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | taxonomic analysis |
| Collectors: | Matsushita |
| Collection method comments: COLLECTOR: H. Matsushita (Kyushu University). REPOSITORY: Unknown/ | |
| Taxonomic list comments:COVERAGE: Cephalopoda, but also including bivalvia, scaphopoda, brachiopoda, and sharks. NOMENCLATURE: Authoritative and with fairly modern nomenclature for Cephalopoda; antiquated nomenclature for other taxa but with species resolution identifications. | |
Metadata
| Database number: | 81199 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2008-06-10 06:13:38 | Last modified: | 2019-09-01 16:34:27 |
| Access level: | the public | Released: | 2008-06-10 06:13:38 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 27364. | T. Kobayashi. 1954. A new cymatoceratid from the Palaeogene of northern Kyushu in Japan. Japanese Journal of Geology and Geography 24:15-21 [A. Hendy/A. Hendy] |