Sa 231, Sanchu area, upper Ishido Formation, Gunma: Late Barremian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Hydrozoa
- Hydroida
- Chondroplidae
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| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 36.1° North, 138.8° East (view map) |
| Paleocoordinates: | 46.4° North, 146.0° East (Wright 2013) |
| Basis of coordinate: | stated in text |
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| Stage: | Barremian | 10 m.y. bin: | Cretaceous 2 |
| Key time interval: | Late Barremian | ||
| Age range of interval: | 125.77 - 121.4 m.y. ago |
Stratigraphy
| Formation: | Ishido | ||||
| Local section: | Sanchu Graben | Local bed: | 180 m | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: upper Ishido Formation | |||||
Lithology and environment
| Primary lithology: | lithified calcareous sandstone |
| Lithology description: very fine-grained calcareous sandstone | |
| Environment: | coastal indet. |
| Glacial or sequence phase: | transgressive |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 66081 | ||
| Authorizer: | W. Kiessling | Enterer: | U. Merkel |
| Modifier: | G. Palazzo | Research group: | marine invertebrate |
| Created: | 2006-09-28 05:10:46 | Last modified: | 2026-02-11 16:20:33 |
| Access level: | the public | Released: | 2006-09-28 05:10:45 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 18928. | G. D. Stanley, Jr. and Y. Kanie. 1985. The first mesozoic chondrophorine (medusoid hydrozoan) from the Lower Cretaceous of Japan. Palaeontology 28(1):101-109 [W. Kiessling/U. Merkel] |