Tofta Beds Brachiopods: Sheinwoodian, Sweden
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Rhynchonellata
- Pentamerida
- Parastrophinidae
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Anastrophia deflexa
(Sowerby 1839)
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Rhynchonellata
- Atrypida
- Atrypidae
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Atrypa reticularis
(Linnaeus 1758)
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| original and current combination Anomia reticularis | |||||||
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? Spinatrypa ? sp.
Stainbrook 1951
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Rhynchonellata
- Spiriferida
- Cyrtiidae
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Cyrtia exporrecta
(Wahlenberg 1818)
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| recombined as Cyrtia exporrectus | |||||||
| see common names | |||||||
Geography
| Country: | Sweden | State/province: | Gotland |
| Coordinates: | 57.5° North, 18.4° East (view map) | ||
| Paleocoordinates: | 21.6° South, 2.9° West | ||
| Basis of coordinate: | based on political unit | ||
| Geographic resolution: | local area |
Time
| Period: | Silurian | Epoch: | Wenlock |
| Stage: | Sheinwoodian | 10 m.y. bin: | Silurian 2 |
| Key time interval: | Sheinwoodian | ||
| Age range of interval: | 433.40000 - 430.50000 m.y. ago |
Stratigraphy
| Formation: | Tofta Beds | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Correlation from Jeppsson (1983), Fossils and Strata 15:128 | |||||
Lithology and environment
| Primary lithology: | oncoidal "limestone" | ||
| Secondary lithology: | "reef rocks" | ||
| Environment: | lagoonal/restricted shallow subtidal | Tectonic setting: | cratonic basin |
| Glacial or sequence phase: | transgressive | ||
| Geology comments: SEP: Silurian of Gotland has been variably described as a ramp and platform. Based on my read of the literature, I think if falls best into the ramp category. From Samtleben et al. (1996). Geol. Rundsch 85:278-292; "Predominant in this unit are oncolitic limestones and biostromal carbonate buildups which were formed by algae and a few stromatopore species. A monotonous benthic association comprised only of a few species indicates restricted marine, somewhat lagoonal conditions. Mud cracks are evidence of episodic emersion and desiccation." | |||
Taphonomy
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 13526 | ||
| Authorizer: | M. Foote | Enterer: | M. Foote |
| Modifier: | M. Foote | Research group: | marine invertebrate |
| Created: | 2002-04-12 08:26:30 | Last modified: | 2006-09-15 15:15:11 |
| Access level: | the public | Released: | 2002-04-12 08:26:30 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 6126. | M. G. Bassett and L. R. M. Cocks. 1974. A review of Silurian brachiopods from Gotland. Fossils and Strata (3)1-56 [M. Foote/M. Foote/M. Foote] |