Caves, dinosaurs and the Carnian Pluvial Episode: Recalibrating Britain's Triassic karst ‘fissures’

Simms, Michael J.; Drost, Kerstin

doi:10.1016/j.palaeo.2024.112041

Palaeogeography, Palaeoclimatology, Palaeoecology

2024

DOI: 10.1016/j.palaeo.2024.112041

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Caves, dinosaurs and the Carnian Pluvial Episode: Recalibrating Britain's Triassic karst ‘fissures’

Michael J. Simms,

Kerstin Drost

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Cited by 2 publications

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A new procolophonid with complex dentition from the Late Triassic of southwest England

Meade,

Butler,

Jones

et al. 2024

Papers in Palaeontology

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Fissure fill deposits from the Late Triassic to Early Jurassic of England and Wales preserve a diverse small tetrapod fauna including procolophonids, an important group of Permian and Triassic parareptiles that radiated across Pangaea following the end‐Permian extinction event. Procolophonids are currently known from two fissure fill sites: incomplete and isolated remains from Ruthin Quarry (Wales) and type and referred material of Hwiccewyrm trispiculum from Cromhall Quarry (southwest England). The age of the Cromhall fissure deposits has been debated but recent radiometric dating suggests a Carnian age for at least some of the fossil assemblages. Here, we present material from several fissure assemblages at Cromhall, which are interpreted as stratigraphically older than the assemblage that yielded Hwiccewyrm. We describe a new species of leptopleuronine procolophonid based on partial remains with unique tooth morphology. Threordatoth chasmatos gen. et sp. nov. is characterized by maxillae with a reduced number of complex tricuspid teeth along with dentaries that bear labiolingually compressed monocuspid teeth and in some cases have a peculiar edentulous tip. These distinct tooth morphologies occlude closely, perhaps facilitated by a flexible dentary symphyseal connection. This unique combination of characters may suggest a high degree of oral food processing of a mode unlike other procolophonids, occurring among the broader leptopleuronine adaptation towards diets of high‐fibre herbivory/omnivory and insectivory. Phylogenetic analysis places the remains of Threordatoth as a derived leptopleuronine, sister taxon to Hwiccewyrm, in a clade with taxa including Soturnia, Hypsognathus, Libognathus and two unnamed leptopleuronines from the southwest USA.

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A new procolophonid with complex dentition from the Late Triassic of southwest England

Meade,

Butler,

Jones

et al. 2024

Papers in Palaeontology

View full text Add to dashboard Cite

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A new sympatric occurrence of lagerpetids (Pan-Aves, Pterosauromorpha) in the upper Triassic of southern Brazil

Garcia,

Fonseca,

Doering

et al. 2024

Journal of South American Earth Sciences

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Caves, dinosaurs and the Carnian Pluvial Episode: Recalibrating Britain's Triassic karst ‘fissures’

Cited by 2 publications

References 79 publications

A new procolophonid with complex dentition from the Late Triassic of southwest England

A new procolophonid with complex dentition from the Late Triassic of southwest England

A new sympatric occurrence of lagerpetids (Pan-Aves, Pterosauromorpha) in the upper Triassic of southern Brazil

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