| Westbury Formation | |
|---|---|
| Stratigraphic range: Rhaetian PreꞒ Ꞓ O S D C P T J K Pg N | |
| Type | Geological formation |
| Unit of | Penarth Group |
| Underlies | Lilstock Formation |
| Overlies | Blue Anchor Formation |
| Thickness | 5-10 m |
| Lithology | |
| Primary | Mudstone, Shale |
| Other | Limestone, Sandstone |
| Location | |
| Region | Europe |
| Country |  UK |
| Type section | |
| Named for | Westbury-on-Severn |
The Westbury Formation is a geological formation in England, one of the Penarth Group. It dates back to the Rhaetian. The formation is named after the village of Westbury-on-Severn in Gloucestershire. The remains of a giant shastasaurid and dinosaurs are known from the formation.
Vertebrate fauna
| Vertebrates reported from the Westbury Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Avalonianus | A. sanfordi | Wedmore Hill | "Several now lost teeth." | |||
|
C. borealis |
Westbury-on-Severn |
"Vertebrae, pubis, ischium, femur, tibia, phalanges, adult." |
 | |||
| Ichthyotitan | I. severnensis | Blue Anchor and Lilstock | Two partial surangulars | Possibly one of the largest marine reptiles | ||
| Picrodon | P. herveyi | Wedmore Hill | "Tooth." | |||
| Shastasauridae | Indeterminate | Aust | "Three partial specimens." | |||
| Pachystropheus | Several partial postcranial skeletons | A small thalattosaurian marine reptile, youngest known thalattosaur | ||||
| Lissodus | L. minimus | A hybodont shark | ||||
| Saurichthys | A pike or gar-like predatory fish | |||||
| Sargodon | A dapediiform fish | |||||
| Gyrolepis | A ray-finned fish | |||||
| Birgeria | A large predatory fish |  | ||||
| Ceratodus | A lungfish | |||||
See also
References
- ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Triassic, Europe)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 521–525. ISBN 0-520-24209-2.
- The BGS Lexicon of Named Rock Units — Result Details: Westbury Formation
- ^ Lomax, Dean R.; De la Salle, Paul; Massare, Judy A.; Gallois, Ramues (2018-04-09). Wong, William Oki (ed.). "A giant Late Triassic ichthyosaur from the UK and a reinterpretation of the Aust Cliff 'dinosaurian' bones". PLOS ONE. 13 (4): e0194742. Bibcode:2018PLoSO..1394742L. doi:10.1371/journal.pone.0194742. ISSN 1932-6203. PMC 5890986. PMID 29630618.
- ^ Lomax, D. R.; de la Salle, P.; Perillo, M.; Reynolds, J.; Reynolds, R.; Waldron, J. F. (2024). "The last giants: New evidence for giant Late Triassic (Rhaetian) ichthyosaurs from the UK". PLOS ONE. 19 (4). e0300289. doi:10.1371/journal.pone.0300289. PMC 11023487.
- ^ H. G. Seeley. (1898). On large terrestrial saurians from the Rhaetic Beds of Wedmore Hill, described as Avalonia sanfordi and Picrodon herveyi. Geological Magazine, decade 4 5:1-6
- Galton, P. M. (1985). Notes on the Melanorosauridae, a family of large prosauropod dinosaurs (Saurischia: Sauropodomorpha). Geobios, 18(5), 671-676.
- "Table 12.1," in Weishampel, et al. (2004). Page 234.
- ^ Quinn, Jacob G.; Matheau-Raven, Evangelos R.; Whiteside, David I.; Marshall, John E. A.; Hutchinson, Deborah J.; Benton, Michael J. (2024-06-04). "The relationships and paleoecology of Pachystropheus rhaeticus , an enigmatic latest Triassic marine reptile (Diapsida: Thalattosauria)". Journal of Vertebrate Paleontology. doi:10.1080/02724634.2024.2350408. ISSN 0272-4634.