Cromhall Quarry general: Carnian, United Kingdom
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
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Cryptovaranoides microlanius n. gen., n. sp.
Whiteside et al. 2022
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Whiteside et al. 2022 | 15 specimens | ||||||||
| NHMUK PV R36822, a partly articulated anterior skeleton and associated partial skull and lower jaws; left maxilla R36999; right maxilla R37279; fragment of right maxilla R37280; left dentary R37001; fragment of left dentary R37282; right dentary R37281; left coronoid R37273; left frontal R37274; left quadrate R37604; braincase R37377; premaxilla R37378; sacral vertebrae R37275; cervical vertebra R37276; dorsal vertebra R37277. | ||||||||||
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Pelecymala robustus n. gen., n. sp.
Fraser 1986
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Fraser 1986 | 3 specimens | ||||||||
| AUP 11140 (holotype), maxilla. AUP 11214, 11215 | ||||||||||
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Planocephalosaurus robinsonae n. gen., n. sp.
Fraser 1982
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751 specimens | |||||||||
| AUP 11061, maxilla (holotype). In total 750 additional elements known from Cromwell Quarry, but probably from multiple sublocalities | ||||||||||
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Reptilia
- Sphenodontidae
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Sigmala sigmala n. gen., n. sp.
Fraser 1986
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Fraser 1986 | 3 specimens | ||||||||
| AUP 11083 (holotype), maxilla. AUP 11082, 11084 | ||||||||||
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Reptilia
- Drepanosauridae
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Drepanosauridae indet.
Berman and Reisz 1992
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Renesto and Fraser 2003 | 10 specimens | ||||||||
| AUP 11362, UMCZ 2004.4-5-6, 204-17, 2004.7, 2004.15-16, 2004.8, 2004.9 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United Kingdom | State/province: | England | County: | Gloucestershire |
| Coordinates: | 51.6° North, 2.4° West (view map) | ||||
| Paleocoordinates: | 20.6° North, 6.5° East | ||||
| Basis of coordinate: | stated in text | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Triassic | Epoch: | Late Triassic |
| Stage: | Carnian | 10 m.y. bin: | Triassic 3 |
| *Period: | Late/Upper Triassic - Late/Upper Triassic | ||
| *International age/stage: | Norian - Norian | ||
| Key time interval: | Carnian | ||
| Age range of interval: | 237 - 227 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Whiteside & Marshall (2008) argue for a Rhaetian age based upon the shared presence of Planocephalosaurus with deposits at Tytherington dated as Rhaetian on the basis of palynomorphs, and the presence of fish remains that are typical of the Rhaetian Penarth Group.
This is a collection for specimens from the Cromhall Quarry for which more specific locality data is not provided | |||||
Lithology and environment
| Primary lithology: | lithified "limestone" |
| Secondary lithology: | green,red or brown mudstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: red or green mudstones interbedded with thin limestones largely composed of recemented detrital crinoid debris | |
| Environment: | fissure fill |
Taphonomy
| Modes of preservation: | body |
| Degree of concentration: | -multiple events |
| Size of fossils: | macrofossils,mesofossils |
| Preservation of anatomical detail: | variable |
| Abundance in sediment: | common |
| Disassociated minor elements: | all |
| Fragmentation: | frequent |
| Temporal resolution: | condensed |
Collection methods and comments
| Collection methods: | bulk,chemical,mechanical,acetic,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Material in University of Aberdeen palaeontological collection
Bone material is extracted from well cemented sediments by placing them in acetic or formic acid baths (between 5 percent and 15 percent solution) and then thoroughly washing and sifting the residues. However, where the bone occurs in soft marls it must be removed manually using fine needles. | |
Metadata
| Also known as: | Slickstones | ||
| Database number: | 13177 | ||
| Authorizer: | E. Fara, M. Carrano | Enterer: | E. Fara, M. Carrano |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2002-01-25 04:22:03 | Last modified: | 2024-02-16 10:24:27 |
| Access level: | the public | Released: | 2002-01-25 04:22:03 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 44063. | N. C. Fraser. 1982. A new rhynchocephalian from the British Upper Trias. Palaeontology 25(4):709-725 [R. Butler/R. Butler] |
Secondary references:
| 44066 | N. C. Fraser. 1986. New Triassic sphenodontids from south-west England and a review of their classification. Palaeontology 29:165-186 [R. Butler/R. Butler] | |
| 32376 | N. C. Fraser and S. Renesto. 2005. Additional drepanosaur elements from the Triassic fissure infills of Cromhall Quarry, England. Jeffersoniana 15:1-16 [R. Butler/R. Butler] | |
| 44064 | N. C. Fraser and G. M. Walkden. 1984. The postcranial skeleton of the Upper Triassic sphenodontid Planocephalosaurus robinsonae. Palaeontology 27(3):575-595 [R. Butler/R. Butler] | |
| 32241 | S. Renesto and N. C. Fraser. 2003. Drepanosaurid (Reptilia: Diapsida) remains from a Late Triassic infilling at Cromhall Quarry (Avon, Great Britain). Journal of Vertebrate Paleontology 23(3):703-705 [R. Butler/R. Butler] | |
| 32240 | S. Renesto, J. A. Spielmann, S. G. Lucas and G. T. Spagnoli. 2010. The taxonomy and paleobiology of the Late Triassic (Carnian-Norian: Adamanian-Apachean) drepanosaurs (Diapsida: Archosauromorpha: Drepanosauromorpha). New Mexico Museum of Natural History and Science, Bulletin 46:1-81 [R. Butler/R. Butler] | |
| 87573 | M. J. Simms and K. Drost. 2024. Caves, dinosaurs and the Carnian Pluvial Episode: Recalibrating Britain’s Triassic karst ‘fissures'. Palaeogeography, Palaeoclimatology, Palaeoecology 638:112041 [M. Carrano/M. Carrano] | |
| 89216 | D. I. Whiteside, S. A. V. Chambi-Trowell, and M. J. Benton. 2022. A Triassic crown squamate. Science Advances 8(48):1–18 [M. Carrano/M. Carrano] |