Tanohata Fm Oj 5825-2 - Tanohata: Late Aptian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Crinoidea
- Isocrinida
- Isocrinidae
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Isocrinus (Chladocrinus) cf. neocomiensis
(Desor 1845)
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| see common names | |||||||
Geography
| Country: | Japan | State/province: | Iwate |
| Coordinates: | 40.1° North, 141.8° East (view map) | ||
| Paleocoordinates: | 48.3° North, 151.0° East (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| 10 m.y. bin: | Cretaceous 2-3 | ||
| Key time interval: | Late Aptian | ||
| Age range of interval: | 119.57 - 113.2 m.y. ago |
Stratigraphy
| Geological group: | Miyako | Formation: | Tanohata | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Miyako group extends from Aptian - Albian. This collection comes from one of the uppermost Aptian formations in the group, but is the fm. immediately below the Hiraiga Fm. Specimens of the Isocrinus species reported here occur in the upper portions of the Tanohata Fm, 4 m below the contact with Hiraiga Fm. | |||||
Lithology and environment
| Primary lithology: | bioturbation lithified sandy siltstone |
| Lithology description: sandy siltstone, extensively bioturbated. disarticulated colums and brachials occur throughout the sediment. specimens are better preserved in siltstone than those from sandstone. | |
| Environment: | transition zone/lower shoreface |
| Geology comments: relatively shallow, quiet water | |
Taphonomy
| Modes of preservation: | body,original calcite |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | variable |
| Abundance in sediment: | few |
| Articulated whole bodies: | none |
| Disassociated major elements: | many |
| Disassociated minor elements: | many |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Taxonomic list comments:specimens appear to be stored at University Museum, University of Tokyo | |
Metadata
| Database number: | 65652 | ||
| Authorizer: | A. Miller | Enterer: | C. Ferguson | Research group: | marine invertebrate |
| Created: | 2006-09-23 19:20:10 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2006-09-23 19:20:09 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 18878. | T. Oji. 1985. Early Cretaceous Isocrinus from Northeast Japan. Palaeontology 28(4):629-642 [A. Miller/C. Ferguson] |