Cromhall Quarry general (Triassic of the United Kingdom)

Also known as Slickstones

Where: England, United Kingdom (51.6° N, 2.4° W: paleocoordinates 20.6° N, 6.5° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Carnian (237.0 - 228.0 Ma)

• 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

• group of beds-level stratigraphic resolution

Environment/lithology: fissure fill; lithified limestone and green mudstone

• red or green mudstones interbedded with thin limestones largely composed of recemented detrital crinoid debris

Size classes: macrofossils, mesofossils

Collection methods: bulk, chemical, mechanical, acetic,

• 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.

Primary reference: N. C. Fraser. 1982. A new rhynchocephalian from the British Upper Trias. Palaeontology 25(4):709-725 [R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13177: authorized by Emmanuel Fara, entered by Emmanuel Fara on 25.01.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Eosuchia -
Pelecymala robustus n. gen. n. sp.1, Planocephalosaurus robinsonae n. gen. n. sp.
Pelecymala robustus n. gen. n. sp.1 Fraser 1986 lepidosaur
AUP 11140 (holotype), maxilla. AUP 11214, 11215
Planocephalosaurus robinsonae n. gen. n. sp. Fraser 1982 lepidosaur
AUP 11061, maxilla (holotype). In total 750 additional elements known from Cromwell Quarry, but probably from multiple sublocalities
 Eosuchia - Sphenodontidae
Sigmala sigmala n. gen. n. sp.1
Sigmala sigmala n. gen. n. sp.1 Fraser 1986 lepidosaur
AUP 11083 (holotype), maxilla. AUP 11082, 11084
 Diapsida - Drepanosauridae
Drepanosauridae indet.2 Berman and Reisz 1992 diapsid
AUP 11362, UMCZ 2004.4-5-6, 204-17, 2004.7, 2004.15-16, 2004.8, 2004.9