Chit Rocks, archosaur specimen, Otter Sst (EXEMS 60/1985.133): Anisian, United Kingdom
collected by P. S. Spencer
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
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| 1 specimen | ||||||||||
| EXEMS 60/1985.133, tooth | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United Kingdom | State/province: | England | County: | Devon |
| Coordinates: | 50.7° North, 3.2° West (view map) | ||||
| Paleocoordinates: | 27.8° North, 19.4° East (Wright 2013) | ||||
| Basis of coordinate: | stated in text | ||||
| Altitude: | 0 meters | ||||
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Middle Triassic |
| Stage: | Anisian | 10 m.y. bin: | Triassic 2 |
| Key time interval: | Anisian | ||
| Age range of interval: | 246.7 - 241.464 m.y. ago |
Stratigraphy
| Geological group: | Sherwood Sandstone | Formation: | Otter Sandstone | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: late Anisian: "The unit is dated as Anisian on the basis of faunal comparisons and matching with palynologically dated units in the English Midlands... This has since been confirmed by magnetostratigraphy (Hounslow and McIntosh 2003), who found that the lower parts of the Otter Sandstone Formation correspond to the early and mid Anisian, and the upper parts, which contain the majority of the macrofossils correlate with late Anisian and latest Anisian magnetozones on the marine standard." | |||||
Lithology and environment
| Primary lithology: | not reported |
| Environment: | fluvial-lacustrine indet. |
| Geology comments: "The middle and upper parts of the formation are of fluvial origin; sandstones were deposited by ephemeral braided streams flowing from the south and south-west. The comparatively thin mudstones are interpreted as the deposits of temporary lakes on the floodplain. The calcretes indicate subaerial soil and subsurface calcrete formation in semi-arid conditions. The climate was semi-arid, with long periods when river beds dried out, and seasonal or occasional rains leading to violent river action and flash floods." | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Disassociated minor elements: | all |
Collection methods and comments
| Collection methods: | survey of museum collection |
| Reason for describing collection: | taxonomic analysis |
| Collectors: | P. S. Spencer |
Metadata
| Database number: | 89000 | ||
| Authorizer: | R. Butler | Enterer: | R. Butler |
| Modifier: | R. Butler | Research group: | vertebrate |
| Created: | 2009-04-28 00:57:32 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2009-04-28 00:57:32 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 29836. | M. J. Benton and D. J. Gower. 1997. Richard Owen's giant Triassic frogs: archosaurs from the Middle Triassic of England. Journal of Vertebrate Paleontology 17(1):74-88 [R. Butler/R. Butler] |
Secondary references:
| 29803 | P. S. Spencer and K. P. Isaac. 1983. Triassic vertebrates from the Otter Sandstone Formation of Devon, England. Proceedings of the Geologists' Association 94:267-269 [R. Butler/R. Butler] |