Seep facies, Ikushunbetsu River - Poronai Fm: Late/Upper Eocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda
- Turritellidae
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Orectospira wadana
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Amano et al. 2013 | ||||||
Gastropoda
- Naticidae
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Euspira sp.
Agassiz 1837
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1 specimen | ||||||
Gastropoda
- Neogastropoda
- Buccinidae
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Bathyancistrolepis sp.
(Habe and Ito 1968)
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2 specimens | ||||||
Bathyancistrolepis mikasaensis n. sp.
Amano and Oleinik 2016
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Amano and Oleinik 2016 | ||||||
Ancistrolepis modestoideus
(Takeda 1953)
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Amano and Oleinik 2016 | ||||||
original and current combination Neptunea modestoidea | |||||||
Bivalvia
- Nuculanida
- Malletiidae
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Malletia poronaica
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Amano et al. 2013 | ||||||
Bivalvia
- Nuculanida
- Sareptidae
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Portlandia watasei
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Amano et al. 2013 | ||||||
Bivalvia
- Nuculanida
- Yoldiidae
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Yoldia sp.
Möller 1842
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1 specimen | ||||||
Bivalvia
- Cardiida
- Vesicomyidae
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Hubertschenckia ezoensis
(Yokoyama 1890)
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17 specimens | ||||||
Bivalvia
- Lucinida
- Thyasiridae
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Conchocele bisecta
(Conrad 1849)
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45 specimens | ||||||
Bivalvia
- Carditida
- Carditidae
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Cyclocardia sp.
Conrad 1867
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Amano et al. 2013 | ||||||
see common names |
Geography
Country: | Japan |
Coordinates: | 43.3° North, 142.0° East (view map) |
Paleocoordinates: | 45.5° North, 138.3° East |
Basis of coordinate: | based on nearby landmark |
Geographic resolution: | small collection |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
Key time interval: | Late/Upper Eocene | ||
Age range of interval: | 37.71000 - 33.90000 m.y. ago |
Stratigraphy
Formation: | Poronai | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Poronai Fm. Relationships to adjacent units not stated in text. THICKNESS: Sample from individual concretion (2m in diameter). AGE: Poronian stage, Late Eocene. STRATIGRAPHIC POSITION: From B zone of Teshima (1955), although the position of this zone relative to the entire formation is not stated in text. |
Lithology and environment
Primary lithology: | lithified "carbonate" |
Secondary lithology: | poorly lithified mudstone |
Includes fossils? | Y |
Lithology description: SPECIFIC LITHOLOGY: Calcareous concretion within dark gray mudstone. LITHIFICATION: Lithified based on figured specimens and facies description. | |
Environment: | basinal (siliciclastic) |
Geology comments: ENVIRONMENT: Sublittoral-bathyal molluscan fauna. Foraminiferal assemblage suggests that maximum water depth was no more than 350 m. Assigned to a basinal environment. |
Taphonomy
Modes of preservation: | body,concretion |
Degree of concentration: | concentrated |
Size of fossils: | macrofossils |
Articulated whole bodies: | many |
Feeding/predation traces: | drill holes |
Spatial resolution: | autochthonous |
Collection methods and comments
Collection methods: | bulk,field collection |
Reason for describing collection: | paleoecologic analysis |
Collection method comments: COLLECTOR: K. Amano and R. G. Jenkins (c. 2006). REPOSITORY: Joetsu University of Education (JUE). | |
Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Not an authoriative publication, but with modern nomenclature, species and subgenus-level assignments. |
Metadata
Database number: | 71009 | ||
Authorizer: | A. Hendy, M. Uhen | Enterer: | A. Hendy, M. Uhen |
Modifier: | M. Uhen | Research group: | marine invertebrate |
Created: | 2007-04-14 09:33:29 | Last modified: | 2019-10-11 15:27:25 |
Access level: | authorizer only | Released: | 2008-04-14 09:33:29 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
23797. | K. Amano and R. G. Jenkins. 2007. Eocene drill holes in cold-seep bivalves of Hokkaido, northern Japan. Marine Ecology 28:108-114 [A. Hendy/A. Hendy] |
Secondary references:
70597 | K. Amano, R. G. Jenkins, Y. Sako, M. Ohara, and S. Kiel. 2013. A Paleogene deep-sea methane-seep community from Honshu, Japan. Palaeogeography, Palaeoclimatology, Palaeoecology 387:126-133 [M. Uhen/M. Uhen] | |
70447 | K. Amano and A. Oleinik. 2016. Ancistrolepidine gastropods (Buccinidae) from the upper Eocene hydrocarbon seep deposits in Hokkaido, northern Japan. The Nautilus 130(4):158-163 [M. Uhen/M. Uhen] |