Belmont d’Azergues (Lafarge quarry), Middle Toarcian (bifrons/variabilis): Middle Toarcian, France
collected 1983-2013
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Nautilida
- Cenoceratidae
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Cenoceras belmontense n. sp.
Rulleau 2008
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Rulleau 2008 | |||||||||
| (7 measurements) | ||||||||||
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Cenoceras ciryi
Rulleau 2008
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Rulleau 2008 | |||||||||
| (2 measurements) | ||||||||||
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Cenoceras ex gr. astacoides
(Young and Bird 1832)
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Rulleau 2008 | |||||||||
| (1 measurement) | ||||||||||
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Cenoceras thiollieri
Tinant 1998
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Rulleau 2008 | |||||||||
| (1 measurement) | ||||||||||
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Reptilia
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Thalattosuchia indet.
(Fraas 1901)
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1 specimen | |||||||||
| MHNL 20103015 is a piece of jaw presented in section and showing internal vacuities | ||||||||||
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Temnodontosaurus azerguensis n. sp.
Martin et al. 2012
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Martin et al. 2012 | 1 specimen | ||||||||
| An unnumbered and almost complete skeleton preserved with its ventral surface exposed (Fig. 2A). The specimen is cemented to a 10-m concrete slab on permanent display at Muse´e des Amis de la Mine in Saint-Pierre La Palud, Rhone department, France (MAMSPLP), Hildoceras bifrons Zone | ||||||||||
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Reptilia
- Stenopterygiidae
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Stenopterygiidae indet.
Kühn 1934
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1 specimen | |||||||||
| MHNL 20103016 (variabilis zone) is an incomplete femur with a partially preserved distal end, this specimen is tentatively referred to Stenopterygiidae indet. | ||||||||||
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Actinopteri
- Semionotiformes
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Semionotiformes indet.
Arambourg and Bertin 1958
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1 specimen | |||||||||
| an isolated ganoid scale (MHNL 20103063), consists of a square-shaped scale without ornamentation and with surface and edges smoothed by erosion, possibly referable to Lepidotes or Dapedium | ||||||||||
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Chondrichthyes
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Neoselachii sp.
Compagno 1977
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1 specimen | |||||||||
| PF Toa 623, tooth, Hildoceras bifrons Zone | ||||||||||
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Chondrichthyes
- Hybodontiformes
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Hybodontiformes indet.
Patterson 1966
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1 specimen | |||||||||
| PF Aal 323, spine, Middle Toarcian (bifrons or variabilis Zone) | ||||||||||
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Chondrichthyes
- Hybodontiformes
- Hybodontidae
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Hybodus sp.
Agassiz 1834
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1 specimen | |||||||||
| MHNL 20103017, tooth, Haugia variabilis Zone | ||||||||||
| see common names | ||||||||||
Geography
| Country: | France | State/province: | Rhone |
| Coordinates: | 45.9° North, 4.7° East (view map) | ||
| Paleocoordinates: | 34.6° North, 15.5° East | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Early/Lower Jurassic |
| Stage: | Toarcian | 10 m.y. bin: | Jurassic 3 |
| Key time interval: | Middle Toarcian | Ammonoid zone: | Hildoceras bifrons and Haugia variabilis |
| Age range of interval: | 182.90000 - 180.40000 m.y. ago |
Stratigraphy
| Stratigraphy comments: The middle Toarcian sequence (bifrons zone to variabilis zone) |
Lithology and environment
| Primary lithology: | bioturbation,phosphatic marl |
| Secondary lithology: | ooidal "limestone" |
| Lithology description: The middle Toarcian sequence (bifrons zone to variabilis zone) is represented by an ∼2.5 m interval of ammonite- and belemnite-rich purplish bioturbated marls (‘Marnes médianes’; Elmi & Rulleau, 1991) with a few dispersed phosphatic ooliths and interrupted by thin and discontinuous oolithic limestone beds | |
| Environment: | marine indet. |
| Geology comments: a succession of fully marine strata... that were deposited at relatively shallow depths near the easternmost reach of the Massif Central | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | selective quarrying,field collection,survey of museum collection |
| Reason for describing collection: | taxonomic analysis | Collection dates: | 1983-2013 |
| Collection method comments: Collections in 1984 by M. Dejob and Ms. Laurent
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) | |
| Taxonomic list comments:"ammonite- and belemnite-rich" | |
Metadata
| Database number: | 133652 | ||
| Authorizer: | R. Benson, M. Clapham | Enterer: | R. Benson, M. Clapham |
| Modifier: | R. Benson | Research group: | vertebrate |
| Created: | 2012-09-20 22:59:59 | Last modified: | 2013-03-10 13:59:33 |
| Access level: | the public | Released: | 2012-09-20 22:59:59 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 45493. | 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] |
Secondary references:
| 43067 | J. E. Martin, V. Fischer, P. Vincent and G. Suan. 2012. A longirostrine Temnodontosaurus (Ichthyosauria) with comments on Early Jurassic ichthyosaur niche partitioning and disparity. Palaeontology 55(5):995-1005 [R. Benson/R. Benson] | |
| 54623 | L. Rulleau. 2008. Les Nautiles du Lias et du Dogger de la Région Lyonnaise 1-149 [M. Clapham/M. Clapham] |