Loc. 6083 (cycle W-9) - Waita Formation: Early/Lower Oligocene, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia
- Carditida
- Carditidae
|
|||||||
Venericardia subnipponica
Nagao 1928
|
26 specimens | ||||||
recombined as Venericardia (Venericor) subnipponica | |||||||
Bivalvia
- Cardiida
- Veneridae
|
|||||||
Phacosoma chikuzenensis
|
54 specimens | ||||||
spelled with current rank as Dosinia (Phacosoma) | |||||||
Pitar matsumotoi
(Nagao 1928)
|
12 specimens | ||||||
original and current combination Pitaria matsumotoi | |||||||
Thecostraca
|
|||||||
Cirripedia indet.
Rafinesque 1816
|
5 specimens | ||||||
see common names |
Geography
Country: | Japan |
Coordinates: | 33.8° North, 130.5° East (view map) |
Paleocoordinates: | 40.3° North, 126.4° East |
Geographic resolution: | small collection |
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
Formation: | Waita | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Waita Fm, which overlies the Honjo Fm of the Ashiya Gp. THICKNESS: From individual bed within formation that reaches 450 m in thickness. AGE: latest Early Oligocene according to Sakakura (2002) on the basis of calcareous nannoplankton and foraminifera (see Saito and Okada, 1984; Tsuchi et al., 1987). STRATIGRAPHIC POSITION: From base of cycle W-9, near top of formation. |
Lithology and environment
Primary lithology: | bioturbation poorly lithified sandstone |
Includes fossils? | Y |
Lithology description: SPECIFIC LITHOLOGY: Bioturbated sandstone. LITHIFICATION: Poorly lithified on the basis of figured specimens and age. | |
Environment: | transition zone/lower shoreface |
Glacial or sequence phase: | transgressive |
Geology comments: ENVIRONMENT: Shallow shelf to offshore siliciclastic environment. From transgressive phase of relative sea-level fluctuation. |
Taphonomy
Modes of preservation: | body |
Degree of concentration: | concentrated |
Size of fossils: | macrofossils |
Preservation of anatomical detail: | excellent |
Abundance in sediment: | abundant |
Spatial resolution: | allochthonous |
Collection methods and comments
Collection methods: | field collection |
Reason for describing collection: | taphonomic analysis |
Collection method comments: COLLECTOR: Presumably Sakakura (c. 2002). REPOSITORY: Possibly Kyoto University, Kyoto, Japan. | |
Taxonomic list comments:COVERAGE: Exhaustive for bivalvia, gastropoda, and inclusive of scaphopods, cirripeds, and echinoids. NOMENCLATURE: Not an authoritative publication, but utilizing relatively modern nomenclature, though not assigned subgenus-level identifications and many occurrences lacking species names. |
Metadata
Database number: | 70769 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
Created: | 2007-04-04 18:30:31 | Last modified: | 2013-11-25 13:37:23 |
Access level: | authorizer only | Released: | 2007-04-04 18:30:29 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
23726. | N. Sakakura. 2002. Taphonomy of bivalve assemblages in the upper part of the Paleogene Ashiya Group, southwestern Japan. Paleontological Research 6(1):101-120 [A. Hendy/A. Hendy] |