Some key Lower Cretaceous sites in Drôme (SE France)

Granier, Bruno

doi:10.4267/2042/62543

Cited by 4 publications

(2 citation statements)

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“…In the Cretaceous, Ptychodus spanned most of the peri-Tethys with a stratigraphic distribution ranging from the Albian–Cenomanian to the Campanian and thus survived for around 30–40 million years (see also ‘Spatial and temporal distribution of Ptychodus from Europe’ section, above). The oldest European specimens of Ptychodus from the Albian of Auvergne-Rhône-Alpes region (southeastern France) indicate that the rise of the peri-Tethyan domain of this durophagous predator would have started in shallow open marine environments (see also Herrle et al, 2003 ; Granier et al, 2017 ). In particular, the Early Cretaceous spatial distribution of Ptychodus included the epicontinental sea area of Vercors platforms (see Fig.…”

Section: Discussionmentioning

confidence: 99%

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The extinct shark, Ptychodus (Elasmobranchii, Ptychodontidae) in the Upper Cretaceous of central-western Russia—The road to easternmost peri-Tethyan seas

Amadori

Solonin

Vodorezov

et al. 2022

Journal of Vertebrate Paleontology

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Isolated teeth belonging to the genus Ptychodus Agassiz, 1834 (Chondrichthyes; Elasmobranchii) from the Upper Cretaceous of the Ryazan and Moscow Oblast regions (European Russia) are described and discussed in detail herein. The taxonomic composition of the Ptychodus assemblage from the Ryazan region is very diverse including the first records of the cuspidate species P. altior and P. anonymus, which thus is largely consistent with those from other contemporaneous European localities. Ptychodus ubiquitously inhabited epicontinental seas of Europe during most of the Cretaceous with the most diverse assemblages coming from southern England, northern Italy, Belgium, and European Russia. Additionally, the material documented here from the Cenomanian of Varavinsky ravine area (Moscow Oblast) represents the northernmost occurrence of Ptychodus hitherto reported from Europe. It is evident that the Late Cretaceous shallow seas of the Russian platform represented a crucial pathway for the dispersal of Ptychodus from the European peri-Tethys to the eastern margins of the Neo-Tethyan Ocean. The Albian-Campanian records of Ptychodus from Europe indicate that its dominance in the peri-Tethys persisted for most of its evolutionary history. A local temperature drop across most of the European shallow seas probably contributed to the narrowing of its geographic range in the peri-Tethyan seas towards the end of the Mesozoic Era. The fossil remains of Ptychodus documented herein are accordingly of utmost importance for better understanding the taxonomic composition of Russian fossil ichthyofaunas and also inform about the dispersal of Ptychodus towards western and eastern peri-Tethyan seas during the Late Cretaceous.

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Section: Discussionmentioning

confidence: 99%

“… Lower Cretaceous paleogeographic maps with occurrences of Ptychodus from the Albian of Clansayes (Auvergne-Rhône-Alpes region, southern France; modified from Granier, 2017 ; see also Table S3 and Table S4 in Supplemental Data). …”

Section: Figurementioning

confidence: 99%