Belmont d’Azergues (Lafarge quarry), Upper Toarcian (Jurassic of France)

Where: Rhone, France (45.9° N, 4.7° E: paleocoordinates 34.6° N, 15.5° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Late/Upper Toarcian (180.1 - 175.6 Ma)

• The lower Toarcian sequence (serpentinum zone)

Environment/lithology: marine; bioturbated, gray, green, red marl

• a succession of fully marine strata... that were deposited at relatively shallow depths near the easternmost reach of the Massif Central
• The upper Toarcian sequence, from 8 to 12.4 m, (‘Marnes supérieures’; Elmi & Rulleau, 1991) consists of purplish to greenish grey bioturbated marls (deep red when weathered)

Size class: macrofossils

Collected in 1983-2013

Collection methods: quarrying,

• Following 30 years of collection (in 2013), including excavations undertaken

•in 2009 and 2010 in the southern part of the quarry allowed new detailed observations and sampling of the Toarcian to lowermost Aalenian sequence, including the lower Toarcian interval, which is otherwise poorly represented in the quarry (Rulleau, 1997).

•Musee des Amis de la Mine in Saint-Pierre La Palud, Rhone department, France (MAMSPLP).

•Espace Pierres Folles in Saint-Jean-des-Vignes, Beaujolais, France (PF)

Primary reference: P. Vincent, J. E. Martin, V. Fischer, G. Suan, B. Khalloufi, B. Suchéras-Marx, A. Léna, K. Janneau, B. Rouselle and L. Rulleau. 2013. Marine vertebrate remains from the Toarcian–Aalenian succession of southern Beaujolais, Rhône, France. Geological Magazine [R. Benson/R. Benson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 140483: authorized by Roger Benson, entered by Roger Benson on 11.03.2013, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• "abundant belemnite rostra and several ammonites diagnostic of the serpentinum ammonite zone"
Cephalopoda
 Nautilida - Cenoceratidae
Cenoceras toarcense d'Orbigny 1850 nautiloid
Digonioceras praecox n. sp. Rulleau 2008 nautiloid
Digonioceras ex gr. robustum Foord and Crick 1890 nautiloid
 Nautilida - Nautilidae
"Cenoceras fourneti" = Ligeiceras fourneti
"Cenoceras fourneti" = Ligeiceras fourneti Dumortier 1874 nautiloid
Reptilia
 Loricata -
Thalattosuchia indet. marine crocodile
PF Toa 468 is a proximal portion of a right curved femur
 Ichthyosauria -
? Temnodontosaurus sp. Lydekker 1889 ichthyosaur
PF Toa 485, possible premaxillae; and PF Toa 467, a partial rostrum