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Colloque cénomanien .pdf



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Colloque Cénomanien
Le Mans 27-29 avril 2016
Musée Vert

Le Mans

Le Cénomanien en Sarthe

Volume des résumés
Organisé par Nicolas Morel, Delphine Desmares et Didier Néraudeau

Gr
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GROUPE FRANÇAIS DU CRÉTACÉ

Colloque Cénomanien
27-29 avril 2016
Musée Vert du Mans

Organisé par
Nicolas Morel, Delphine Desmares & Didier Néraudeau

VOLUME DES RÉSUMÉS

SOMMAIRE

Andrieu S., Brigaud B., Rabourg T. & Noret A. The mid-cenomanian event in shallow marine
environments: influence on carbonate producers and depositional sequences (northern aquitaine
basin, France) .
p13
Audo D., Charbonnier S. & Polette F. Les crustacés du Lagerstätte de Gara Sbaa
(Cénomanien-Turonien, Maroc).
p15
Benmansour S. & Yahiaoui A. Caractérisation lithostratigraphique et paléontologique de la
formation cénomanienne sur le flanc nord de Dj. Bou Arif (Batna-Algérie orientale). (poster) p16
Benyoucef M., Ghenim A.-F., Bouregaa S., Adaci M., Meister C., Mebarki K., Zaoui D., Malti
F.-Z. & Bensalah M. Upper Cenomanian oysters from the Sahara (South Algeria). (poster)
p21
Bessin P., Guillocheau F., Robin C., Bauer H. & Schroëtter J.-M. Exhumation and burial of the
Armorican Massif (Western France) through Cretaceous times. (poster)
p23
Bomou B., Arnaud-Vanneau A. & Adatte T. Large benthic foraminifera stratigraphy and ecology
from the Guerrero-Morelos carbonate platform during the late cenomanian.
p24
Breton G. Faunes cénomaniennes de crustacés décapodes de Normandie et de Sarthe.

p26

Charbonnier S., Audo D., Garassino A. & Hyžný M. Les crustacés des Konservat-Lagerstätten
du Cénomanien du Liban.
p31
Ferré B., Benyoucef M., Adaci M., Zaoui D., Piuz A., Meister C., Mebarki K., Tchenar S. &
Bensalah M. Les assemblages microfaciologiques de Rovéacrinidés (crinoïdes) de la région de
Tinrhert (S.E.-Algérie) à la limite cénomano-turonienne.
p32
Floquet M., Léonide P., Villier L., Ackouala A.-P. & Blenet A. Biosedimentary events and
palaeogeographic changes during late Cenomanian and earliest Turonian times as recorded by the
southern Provence carbonate platforms (SE France).
p36
Gaspard D. & Loubry P. A brachiopod shell show during the middle Cenomanian in the stratotype
area (France) – Residual colour pattern.
p38
Hart M. Foraminifera from the Cenomanian of the Sarthe area (France).

p41

Kočí T., Jäger M. & Morel N. Sabellides et serpulides du Cénomanien de la région du Mans. p44
Kočí T., Kočová Veselská M., Morel N. & Jäger M. Sclerobionts in Pyrgopolon (Pyrgopolon)
deforme (Lamarck, 1818) from the Upper Cenomanian in Le Mans area – preliminary report. p49
Kollmann H. A. Gastropods in Édouard Guéranger´s Cenomanian fossil assemblages of Sarthe: A
short review.
p54
Lasseur E., Fay Gomord O. & Guillocheau F. Le Cénomanien du Bassin de Paris, évolution et
facteurs de contrôles de la sédimentation.
p56
Löser H. The Cenomanian: a time of turnover in coral evolution.

p57

Marok A., Benadla M., Reolid M. & El kamali N. Le passage Cénomanien-Turonien dans l’Atlas
saharien occidental (Algérie) : événements biologiques et isotopiques.
p58
Mary G., Conil P., Papillard M., Pivette B., Redois F., Régnault S. & Viaud J.-M./ CRPG Pays

de la Loire. Le stratotype de l'étage Cénomanien en Sarthe : de l'inventaire du patrimoine
géologique à la protection des sites stratotypiques.
p60
Mebarki K, Adaci M., Meister C., Benyoucef M., Ferré B., Läng E., Cavin L., Zaoui D.,
Desmares D., Villier L., Malti F.-Z. & Bensalah M. Lithostratigraphy, paleoenvironments and
sequence evolution of the Cenomanian-Turonian deposits from the Guir area (SW-Algeria).
p64
Moreau J.-D., Néraudeau D., Tafforeau P. & Dépré E. Plantes silicifiées du Cénomanien
charentais.
p66
Niebuhr B., Schneider S. & Wilmsen M. Forgotten in a sinkhole: stratigraphy, depositional setting
and biofacies of the Cenomanian to lower Turonian Wellheim Formation (Bavaria, Southern
Germany). (poster)
p70
Niebuhr B. & Wilmsen M. Dactyloidites ottoi (Geinitz, 1849), an enigmatic and rare rosetted trace
fossil from the Cenomanian of Saxony and Bavaria (Germany). (poster)
p72
Rantuch J. Rhynchostreon Bayle – an old Late Cretaceous enigma ? (poster)

p74

Redois F., Durand M., Fleury R., Mellier B., Moreau J.-D. & Néraudeau D. Les argiles
ligniteuses du Cénomanien de Hucheloup (Ecouflant, Maine-et-Loire).
p75
Rineau V. & Villier L. La radiation évolutive des rudistes à canaux : le mystère des
Ichthyosarcolites.
p77
Schneider S., Kelly S. R. A., Niebuhr B. & Wilmsen M. Are the bivalves from the Cenomanian
stratotype representative for the Cenomanian stage?
p79
Taylor P. D. & Martha S. O. Bryozoans from the Cenomanian of northwest Europe: a brief review.
p81
Testé M., Masure E., Desmares D., Villier L., Bardin J., Tremblin M., Broche B., Silvia Gardin,
Minoletti F., De Rafelis M., Labourdette N., Cecca F., Rouget I., Morel N. & Raboeuf P. Les
dinoflagellés calcaires et les pithonelles de la région stratotypique du Mans : indicateurs
paléoclimatiques et paléoenvironnementaux.
p86
Villier L., Breton G., Desmares D., Jagt J. W. M., Morel N., Néraudeau D. & Reich M.
Echinoderms of the cretaceous deposits from Le Mans (France): outstanding preservation
conditions for an outstanding fauna.
p89
Wilmsen M. Biofacies and depositional environment of the Lower Upper Cenomanian Oberhäslich
Formation in the Saxonian Cretaceous Basin (Germany). (poster)
p90
Wilmsen M. Cenomanian ammonites from the North Cantabrian Basin (province Cantabria,
northern Spain). (poster)
p92
Wilmsen M. & Niebuhr B. Cenomanian onlap patterns onto the mid-european island: insight from
sections in Saxony and Bavaria (Germany).
p94
Wilson G. D.F. & Morel N. Isopod crustacean fossils from the Cenomanian stratotype: five new
species in suborders Cymothoida, Asellota and Valvifera. (poster)
p96

A BRACHIOPOD SHELL SHOW DURING THE MIDDLE CENOMANIAN IN
THE STRATOTYPE AREA (FRANCE) – RESIDUAL COLOUR PATTERN
Danièle GASPARD1 & Philippe LOUBRY1
1

Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P) UMR 7207, Département Histoire de
la Terre – CP 38, Museum National d'Histoire Naturelle, 8 rue Buffon, 75231 Paris Cedex 05, FRANCE
ds.gaspard@orange.fr and loubry@mnhn.fr

Many attempts have been done to highlight colour banding in the fossil record, generally these
concern molluscs (Seilacher, 1972, Cazes al. 2011, among others). But, while uncommon in
brachiopods, examples have been revealed since the beginning of the 1900’s from the Palaeozoic,
illustrated in black and white in visible light (among others: Collot 1911, Fischer 1925, Hadgorn &
Sandy 1998). Few examples are known from the Mesozoic, the most common is present in Triassic
layers, i.e. Coenothyris vulgaris (Schlotheim 1820) with preserved colour patterns. This former
species gave the opportunity to be in search of comparable observations in the other Mesozoic
stages.
Material and Method
The feature discussed has been observed on brachiopod shells in the collections of the Muséum
national d’Histoire naturelle (MNHN, Paris and those of Le Musée Vert, Le Mans (Sarthe)
(MHNLM). Comparisons have been made concerning the ornamentation, between C. vulgaris
shells and those of a biplicate terebratulid: Sellithyris cenomanensis Gaspard (1982) (Fig. 1), from
the upper part of the Middle Cenomanian (Jalais level), in the stratotype area and particularly
around Le Mans (Gaspard, 2014, 2015 and references herein), the neotype of which exhibiting
some patterns (Fig. 1. 1a-c). The shell of this species is spectacular at many points of views
revealing preserved particularities (Gaspard 2003).
The brachiopod shells revealed radial colour patterns highlighted in cream pale colour when
observed in visible light. The spectacular colouration is enhanced using ultra violet light (UV) with
a wavelength of 360 nm (Fig. 1. 2a-b). But contrarily to Merle et al. 2008 we do not bathed the
shells in a concentrated sodium hypochlorite solution for hours prior to the UV light images.
Observations
At the shell surface, the cream radial pattern is not the same, neither on both valves of the same
shell (Fig. 1. 2a-b), nor considering different representatives of the species (Fig. 1. 3-4, 6-7). No
symmetry is observed in the distribution of the colour patterns on the different valves (Fig. 1. 2a-b;

4b-c; 6b; 8b). The same observations are made for C. vulgaris (Fig. 1. 9, 10).

Figure 1 - 1-4, 6-8. Sellithyris cenomanensis Gaspard, Middle Cenomanian (Jalais level), La Butte du Mans
(Sarthe). 1a-c. Neotype in natural light: dorsal view (a), profile (b), ventral valve (c). Coll. MNHN.F.A50555. 2a-b.
Neotype imaged using UV light: dorsal view (a), ventral view (b). 3a-b. An other specimen from Le Mans, dorsal view
imaged in natural light (a) and using UV light (b); n° MNHN.F.A51528. 4a—c. Specimen from Le Mans observed in
natural light (a) and using UV light, dorsal view (b), ventral valve (c); coll. MHNLM.2010.12.792. 6a-b. A separate
ventral valve in natural (a) and UV light (b) to be compared with specimens illustrated in 2-6. 7a-b. Bivalved posterior
shell in the collections of Le Musée Vert: n° MHNLM.2010.12.790. 8a-c. Fragmented ventral valve imaged in natural
light (a) and UV light, external surface (b) and internal side (c). 5. Specimen of Dalinella Thomson, Holocene,
revealing natural coloured design to be compared with that of S. cenomanensis, personal Coll. 9-10. Coenothyris
vulgaris (Schlotheim), specimens from the Triassic near Toulon (9), and Rehainvillier (France) (10); coll. UPMC,
Jussieu, France.

Discussion
What is the possible weight of these colour patterns along with the external and internal characters
and the microstructural aspects as taxonomic features? What pigments are involved (analyses in
progress)? Do they permeate all the shell thickness as the Fig. 1. 8b-c can show it? How to consider
the pigments in relation with the different components of the shell as a biomaterial, taking into
account the presence of chromoprotein in the organic matrix (Gaspard et al 2008). What
interpretation from the fossil record considering possible diagenetic impacts. While all specimens in
a same population do not reveal the colouration? Holocene brachiopod species like Dalinella
Thomson (Fig. 1. 5) suggest a possible appearance of the shell of S. cenomanensis when alive. The
presence of colouration on/in the shell could have some weight in the interpretation of
palaeodepths.
References
CAZE B., MERLE D., SAINT-MARTIN J.-P. & PACAUD J.-M. (2011). Contribution of residual colour patterns to the
characterization of caenozoic molluscs (gastropoda, bivalvia). Comptes rendus palevol, 10, 171-179.
COLLOT L. (1911). Coloration des coquilles fossiles. Cas nouveaux. Association française pour l’avancement des
sciences, 40° session, Dijon 1911, 321-325.
FISCHER P.-H. (1925). La persistence des couleurs parmi les fossiles du trias moyen. Journal de conchyliologie, 69, 512.
GASPARD D. (1982). Méthodes de discrimination appliquées à des brachiopodes biplisses appartenant au genre
sellithyris middlemiss en vue d’une decision d’ordre specifique. Bulletin de la societe zoologique de france, 107,
195-206.
GASPARD D. (2003). Exceptional preserved organic matrix in cretaceous brachiopod shells – examples from
cenomanian terebratulida of france and belgium. in: european palaeontological association workshop. Exceptional
preservation. Teruel, spain, 49-52.
GASPARD D. (2014). Noteworthy brachiopods of the cenomanian stratotype: a synthesis of the biochronological,
palaeoenvironmental and palaeoecological implications. geobios, 47, 347-370.
GASPARD D. (2015). les brachiopodes, in: ”stratotype du cenomanien”, morel n. (coord.), collection patrimoine
geologique, sous la direction de de wever p. & cornee a., coedition museum national d’histoire naturelle, paris et
biotope, meze, 179-198 + cdrom.
HADGORN H., & SANDY M. R. (1998). Color banding in the triassic terebratulid brachiopod coenothyris from the
muschelkalk of central europe. Journal of paleontology, 72, 11-28.
GASPARD D., MARIN F., GUICHARD N., MOREL S., ALCARAZ G. & LUQUET G. (2008). Shell matrices of recent
rhynchonelliform brachiopods: microstructures and glycosylation studies. Earth and environmental science
transactions of the royal society of Edinburg, 98, 415-424.
MERLE D., PACAUD J.-M., KRILOFF A. & LOUBRY PH. (2008). les motifs colorés residuels des coquilles lutetiennes du
bassin de paris. in: stratotype du Lutétien, MERLE D. (coord.), collection patrimoine geologique. Museum national
d’Histoire naturelle, paris; biotope, meze; BRGM editions, Orleans, 182-227.
SEILACHER A. (1972). Divaricate patterns in pelecypod shells. Lethaia, 5, 325-343.


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