Shitakara Fm - Kushiro Coal Field: Early/Lower Oligocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Peronidea sp.
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Thecostraca
- Balanomorpha
- Balanidae
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Balanus sp.
Da Costa 1778
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Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium sp.
Linnaeus 1758
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Dentalium (Fissidentalium) nunomae
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Gastropoda
- Turritellidae
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Turritella sp.
Lamarck 1799
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Gastropoda
- Neotaenioglossa
- Calyptraeidae
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Crepidula sp.
Lamarck 1799
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Gastropoda
- Neogastropoda
- Buccinidae
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Colus sp.
Röding 1798
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Neptunea modestoidea
Takeda 1953
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Gastropoda
- Naticidae
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Naticidae indet.
Guilding 1834
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Neverita (Neverita) sp.
Risso 1826
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Neverita (Neverita) asagaiensis
(Makiyama 1934)
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Bivalvia
- Nuculanida
- Sareptidae
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Portlandia (Portlandiella) watasei
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| SUBSPECIES: P. (Portlandiella) watasei | ||||||||||
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Yoldia (Yoldia) laudabilis
Yokoyama 1924
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| recombined as Portlandia laudabilis | ||||||||||
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Bivalvia
- Mytilida
- Mytilidae
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Mytilus sp.
Linnaeus 1758
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Mytilus mabuchii
Oyama and Mizuno 1958
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Bivalvia
- Mytilida
- Crenellidae
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Crenella (Megacrenella) informal n. sp. A
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea eorivularis
Oyama and Mizuno 1958
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Bivalvia
- Pectinida
- Pectinidae
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Chlamys shitakaraensis
Honda 1980
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Bivalvia
- Lucinida
- Thyasiridae
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Conchocele bisecta
(Conrad 1849)
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Bivalvia
- Thraciida
- Thraciidae
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Thracia (Thracia) informal n. sp.
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Bivalvia
- Thraciida
- Periplomatidae
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Periploma (Aelga) besshoense
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Periploma (Aelga) ezoense
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Bivalvia
- Pholadida
- Myidae
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Mya (? Arenomya) grewingki
Makiyama 1934
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| INCLUDES: M. (A.) grewingki grewingki and grewingki kusiroensis | ||||||||||
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Bivalvia
- Cardiida
- Mactridae
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Mactra sp.
Linnaeus 1767
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Spisula sp.
Gray 1837
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Spisula (Mactromeris) sorachiensis
Otatsume 1933
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Bivalvia
- Cardiida
- Vesicomyidae
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Hubertschenckia ezoensis
(Yokoyama 1890)
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Bivalvia
- Cardiida
- Veneridae
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Callista sp.
Poli 1791
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Bivalvia
- Cardiida
- Corbiculidae
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Geloina cf. takaoi
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| spelled with current rank as Polymesoda (Geloina) | ||||||||||
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Corbicula (Batissa) sitakaraensis
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Corbicula sp.
Megerle 1811
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Bivalvia
- Cardiida
- Cardiidae
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Nemocardium sp.
Meek 1876
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Nemocardium (Arctopratulum) ezoensis
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Nemocardium (Arctopratulum) yokoymai
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Bivalvia
- Cardiida
- Tellinidae
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Macoma sp.
Leach 1819
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Macoma (Macoma) sejugata
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Bivalvia
- Solenida
- Solenidae
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Solen informal n. sp.
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Bivalvia
- Carditida
- Carditidae
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Cyclocardia sp.
Conrad 1867
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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| see common names | ||||||||||
Geography
| Country: | Japan |
| Coordinates: | 43.0° North, 144.4° East (view map) |
| Paleocoordinates: | 44.8° North, 141.7° East |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | local area |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Early/Lower Oligocene | ||
| Age range of interval: | 33.90000 - 27.82000 m.y. ago |
Stratigraphy
| Geological group: | Urahoro | Formation: | Shitakara | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From middle of the Urahoro Group, lying between the Yubetsu Fm (Early Oligocene) and the Shakubetsu Formation, also of the Urahoro Group (presumably also Early Oligocene). THICKNESS: Unknown thickness of unit. AGE: Presumably Early Oligocene; from near base of Oligocene in region. STRATIGRAPHIC POSITION: Collection representative of entire formation in local area. | |||||
Lithology and environment
| Primary lithology: | fine,pebbly,gray lithified conglomeratic,carbonaceous sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Gray, poorly sorted, fine-grained sandstone and pebbly to granular conglomerate composed of chert pebbles, with intercalated coal seams. LITHIFICATION: Presumed lithified, on the basis of age, presence of coal, and low diversity of fauna. | |
| Environment: | marginal marine indet. |
| Geology comments: ENVIRONMENT: Non-marine through shallow marine. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: COLLECTOR: Unknown collected, possibly Y. Honda. REPOSITORY: Unknown repository. | |
| Taxonomic list comments:COMPLETENESS: Authoritative for Mollusca. NOMENCLATURE: Slightly antiquated, but with consistent use of species level and subgeneric assignments. | |
Metadata
| Database number: | 68894 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-02-12 18:25:48 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | group members | Released: | 2007-02-12 18:25:46 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 19891. | Y. Honda. 1986. A Paleogene molluscan fauna from Hokkaido, northern Japan. Paleontological Society of Japan Special Papers 29:3-15 [A. Hendy/A. Hendy] |