Nakao Forestry Road Locality 102: Callovian - Berriasian, Japan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bennettitales
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Otozamites sp. leaf
Braun 1843
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| mentioned, not illustrated | ||||||||||
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unclassified
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Regnellites nagashimae n. gen., n. sp. multi organs
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| see common names | ||||||||||
Geography
| Country: | Japan | State/province: | Yamaguchi | County: | Shimonoseki |
| Coordinates: | 34.1° North, 131.0° East (view map) | ||||
| Paleocoordinates: | 52.1° North, 139.5° East (Wright 2013) | ||||
| Basis of coordinate: | stated in text |
Time
| Period: | Jurassic - Cretaceous | Epoch: | Middle Jurassic - Early Cretaceous |
| Stage: | Callovian - Berriasian | 10 m.y. bin: | Jurassic 5 - Cretaceous 1 | *Epoch: | Middle - Early |
| Key time interval: | Callovian - Berriasian | ||
| Age range of interval: | 165.3 - 137.05 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Toyonishi | Formation: | Kiyosue | ||
| Stratigraphy comments: The dating of this formaion has not been performed, but the age of theKwanmon Group overlying this formation is suggested to be older than 134 Ma indicating that this formation is older than Valanginian. This formation is not older than the Callovian because the Utano Fm. that underlies the Kiyosue Fm. is dated as Bathonian to Callovian. Thus, the Kiyosue Fm. is possibly also Callovian in age, and therefore Middle Jurassic, contrary to the title of the article. | |||||
Lithology and environment
| Primary lithology: | siltstone |
| Includes fossils? | Y |
| Lithology description: "The fossils occurred in a siltstone intercalating lenticular very fine sandstones with ripple laminae, and their occurence is limited to one horizon ca. 50 cm thick. The lithofacies of this formation is characterized by very fine sandstones with climbing ripple laminae, mudstones with lenticular very fine sandstones, and mudstones intruded by upright root fossils, indicating a fluvial origin." | |
| Environment: | fluvial indet. |
Taphonomy
| Modes of preservation: | mold/impression,adpression,original carbon,original sporopollenin |
| Size of fossils: | microfossils |
Collection methods and comments
| Collection methods: | surface (in situ),chemical,peel or thin section,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: The specimens were all collected from a single ca. 200 x 200 x 300 cm slab. | |
Metadata
| Database number: | 31669 | ||
| Authorizer: | R. Lupia | Enterer: | B. Wilborn |
| Modifier: | M. Carrano | Research group: | paleobotany |
| Created: | 2003-05-21 13:12:04 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | group members | Released: | 2003-08-21 13:12:04 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 8532. | T. Yamada and M. Kato. 2002. Regnellites nagashimae gen. et sp. nov., the oldest macrofossil of Marsileaceae from the upper Jurassic to lower Cretaceous of western Japan. International Journal of Plant Sciences 163(5):715-723 [R. Lupia/B. Wilborn/B. Wilborn] |