Ty12. Sandstone beds. Toya-sawa: Midian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Artiopoda
- Proetida
- Phillipsiidae
|
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| Pseudophillipsia (Carniphillipsia) cf. Pseudophillipsia (Carniphillipsia) raggyorcakaensis | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Japan | State/province: | Miyagi |
| Coordinates: | 39.0° North, 141.5° East (view map) | ||
| Paleocoordinates: | 3.2° North, 135.5° East (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Permian | Epoch: | Guadalupian |
| 10 m.y. bin: | Permian 3-4 | ||
| Key time interval: | Midian | Foram zone: | Monodiexodina sutchanica |
| Age range of interval: | 267.1 - 259.857 m.y. ago |
Stratigraphy
| Formation: | Kamiyasse | Member: | upper | ||
| Local section: | Ty12 | Local bed: | 1 m | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Unit 4 of regional section, with units 1 & 2 in the underlying Hoso-o formation, unit 3 the lower part of Kamiyasse, and unit 5 to overlying Kurosawa formation. | |||||
Lithology and environment
| Primary lithology: | bioturbation,fine sandy sandstone |
| Lithology description: sandy, fossiliferous mudstone. The base of unit-4 starts with matrix-supported conglomerates, showing a sharp, erosive base (Shiino et al., Reference Shiino, Suzuki and Kobayashi2011). The overlying very fine-grained sandstone is poorly sorted because of extensive bioturbation that generally destroyed the primary sedimentary structures. The very fine-grained sandstone includes several fossiliferous layers consisting of brachiopods (e.g., Waagenoconcha imperfecta Prendergast, Reference Prendergast1935), crinoid columns, bryozoans, and bivalves. The components of the assemblages are commonly disarticulated and exhibit a convex-up orientation. In contrast, the bryozoans and Waagenoconcha imperfecta in the sandy layers exhibit their original life postures. | |
| Environment: | offshore |
| Geology comments: The fossiliferous layers of unit-4 were formed by distal storm flows in an offshore to outer shelf environment (Shiino et al., Reference Shiino, Suzuki and Kobayashi2011). | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 278692 | ||
| Authorizer: | P. Wagner | Enterer: | P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2026-05-05 20:59:16 | Last modified: | 2026-05-05 16:05:32 |
| Access level: | the public | Released: | 0000-00-00 00:00:00 |
| Creative Commons license: |
Reference information
Primary reference:
| 94747. | N. Kudo and Y. Shiino. 2026. Taphonomy and environmental distribution of Pseudophillipsia in the middle Permian Kamiyasse Formation of the Southern Kitakami Terrane, Japan. Journal of Paleontology 1-18 [P. Wagner/P. Wagner] |