MJ-5 - Maéjima Fm: Late/Upper Eocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Bivalvia
- Nuculida
- Nuculidae
|
|||||||
|
Acila (Truncacila) cf. nagaoi
Oyama and Mizuno 1958
|
1 specimen | ||||||
|
Bivalvia
- Ostreida
- Malleidae
|
|||||||
|
Isognomon (Hippochaeta) hataii
(Noda and Furuichi 1972)
|
1 specimen | ||||||
|
Bivalvia
- Arcida
- Arcidae
|
|||||||
|
Arca (Arca) uedai
Matsubara 2002
|
1 specimen | ||||||
| recombined as Lamarcka uedai | |||||||
|
Bivalvia
- Cardiida
- Tellinidae
|
|||||||
|
Megangulus maximus
|
3 specimens | ||||||
| spelled with current rank as Tellina (Megangulus) | |||||||
|
Bivalvia
- Carditida
- Carditidae
|
|||||||
|
Cyclocardia sp.
Conrad 1867
|
1 specimen | ||||||
| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 34.6° North, 134.2° East (view map) |
| Paleocoordinates: | 41.9° North, 129.4° East |
| Basis of coordinate: | estimated from map |
| 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: | Maéjima | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Maéjima Fm (also referred to as Maeshima Fm) overlies pre-Tertiary plutonic rocks. THICKNESS: From bed of less than 1 m in thickness within 10 m thick section. AGE: Poorly constrained and debated, although a range of evidence points to a Late Eocene age. Sr isotopes suggest an age of Eocene or older, while foraminiferal and molluscan biostratigraphy points to an Eocene, possibly Late Eocene age. For a long time the Maéjima Fm was considered to be Miocene in age. STRATIGRAPHIC POSITION:From horizon within in the upper part of upper member of the Maéjima Fm. | |||||
Lithology and environment
| Primary lithology: | poorly lithified silty sandstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Muddy sandstone. LITHIFICATION: Poorly-lithified on the basis figured specimens and taphonomic comments. | |
| Environment: | shoreface |
| Geology comments: ENVIRONMENT: Upper sublittoral, muddy to sandy bottom, possibly neighboring a rocky shoreline. TEMPERATURE: Warm-waters. | |
Taphonomy
| Modes of preservation: | body,cast,mold/impression,original calcite |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | poor |
| Temporal resolution: | time-averaged |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | bulk,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: COLLECTOR: T. Matsubara. REPOSITORY: Museum of Nature and Human Activies, Hyogo, Sanda, Japan. | |
| Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Authoritative publication with current nomenclature, and species/subgenus-level assignments. | |
Metadata
| Database number: | 70916 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-04-11 19:36:29 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | authorizer only | Released: | 2007-04-11 19:36:28 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 23780. | T. Matsubara. 2002. Molluscan fauna of the "Miocene" Maéjima Formation in Maéjima Island, Okayama Prefecture, southwest Japan. Paleontological Research 6(2):127-145 [A. Hendy/A. Hendy] |