Loc. 6049 (cycle W-6) - Waita Formation: Early Oligocene, Japan
Where & when
Geology
Taphonomy & methods
Metadata & references
Geography
| Country: | Japan |
| Coordinates: | 33.8° North, 130.5° East (view map) |
| Paleocoordinates: | 36.3° North, 127.3° East (Wright 2013) |
| Geographic resolution: | small collection |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Early Oligocene | ||
| Age range of interval: | 33.9 - 27.3 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-6, in upper part 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: | 70771 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2007-04-04 18:33:30 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | authorizer only | Released: | 2007-04-04 18:33:29 |
| Creative Commons license: | CC0 |
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] |