NE Japan: Turonian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Verrutriletes dubius megaspore
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178 specimens | ||||||
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Trileites persimis megaspore
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35 specimens | ||||||
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Polypodiopsida
- Marsileaceae
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Molaspora lobata megaspore
Hall and Peake 1968
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72 specimens | ||||||
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unclassified
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Bacutriletes arnoldii megaspore
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124 specimens | ||||||
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Erlansonisporites scanicus megaspore
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190 specimens | ||||||
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Osteichthyes
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| Hirayama 2025 | |||||||
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Crocodylia indet.
(Owen 1842)
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Hirayama 2025 | ||||||
| Hirayama 2025 | |||||||
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Osteichthyes
- Testudines
- Adocidae
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| Hirayama 2025 | |||||||
| see common names | |||||||
Geography
| Country: | Japan |
| Coordinates: | 40.1° North, 141.8° East (view map) |
| Paleocoordinates: | 47.5° North, 144.1° East (Wright 2013) |
| Basis of coordinate: | stated in text |
Time
| Period: | Cretaceous | Epoch: | Late Cretaceous |
| Stage: | Turonian | 10 m.y. bin: | Cretaceous 6 |
| *Period: | Cretaceous - Cretaceous | *Epoch: | Late - Late |
| *International age/stage: | Coniacian - Santonian | *Local age/stage: | Upper - Lower |
| Key time interval: | Turonian | ||
| Age range of interval: | 93.9 - 89.8 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
Lithology and environment
| Primary lithology: | siltstone |
| Lithology description: Fossil megaspores were isolated from ca. 50 kg of carbonaceous black, poorly sorted siltstone. (In its basal part, the Tamagawa Formation is characterized by alluvial fan conglomerates with lacustrine mudstones. Above, the bulk of the formation comprises a few fluvial sequences consisting of sandstone and mudstone intercalating with lagoonal sandy mudstones and nearshore sandstones. Black carbonaceous siltstones and mudstones at this level often contain amber, rarely with some insects.) | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | original sporopollenin |
| Size of fossils: | microfossils |
Collection methods and comments
| Collection excludes: | some macrofossils,some microfossils |
| Collection methods: | surface (in situ),chemical,sieve,field collection |
| Minimum sieve size: | 0.125 |
| Reason for describing collection: | general faunal/floral analysis |
| Collection method comments: All specimens are deposited in the Department of Geology and Paleontology, National Science Museum (NSM-PP), Tokyo 169-0073, Japan. | |
Metadata
| Also known as: | Specimens collected along the Tamagawa coast at Noda village, Iwate Prefecture, northern Honshu, Japan (Kuji Group - Tamagawa Fm.) | ||
| Database number: | 32478 | ||
| Authorizer: | R. Lupia, E. Vlachos | Enterer: | T. Naeher, E. Vlachos |
| Modifier: | G. Varnham | Research group: | paleobotany |
| Created: | 2003-07-03 09:39:40 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2003-07-03 09:39:40 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 8756. | M. Takahashi, P. R. Crane, and H. Ando. 2001. Fossil Megaspores of Marsileales and Selaginellales from the Upper Coniacian to Lower Santonian (Upper Cretaceous) of the Tamagawa Formation (Kuji Group) in Northeastern Japan. International Journal of Plant Sciences 162(2):431-439 [R. Lupia/T. Naeher/T. Naeher] |
Secondary references:
| 94268 | R. Hirayama. 2025. Fossil Reptiles from the Kuji Group (Late Cretaceous) of Iwate Prefecture, Japan. Journal of Fossil Research 58(1/2):28-31 [E. Vlachos/E. Vlachos] |