th
10 Annual Meeting of the
European Association of Vertebrate Palaeontologists
Royo-Torres, R., Gascó, F. and Alcalá, L., coord. (2012). 10th Annual Meeting of the European
Association of Vertebrate Palaeontologists. ¡Fundamental! 20: 1–290.
EDITOR: © Fundación Conjunto Paleontológico deTeruel – Dinópolis
COORDINATION: Rafael Royo-Torres, Francisco Gascó and Luis Alcalá. DISEÑOY MAQUETA: © EKIX Soluciones Gráficas DL:TE–72–2012 ISBN–13: 978–84–938173–4–3
PROJECT: CGL 2009 06194-E/BTE Ministerio de Ciencia e Innovación
Queda rigurosamente prohibida, sin la autorización escrita de los autores y del editor, bajo las sanciones establecidas en la ley, la reproducción total o parcial de esta obra por cualquier medio o procedimiento, comprendidos la reprografía y el tratamiento informático. T o dos los derechos reservados.
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the accurate geological study has contributed to understand the succession of dinosaur faunas from the latest Campanian to the end of the Maastrichtian in the Ibero-armorican Island.
The last dinosaurs of Europe: clade-specific
heterogeneity in the dinosaur record of the southern Pyrenees
Geological Setting
Àngel Galobart1, José Ignacio Canudo2, Oriol Oms3, BernatVila2,1, Penélope Cruzado-Caballero2, Violeta Riera3, Rodrigo Gaete4, Fabio M. DallaVecchia1, Josep Marmi1 and Albert G. Sellés1
TheArén Sandstone andTremp Formations represent the coastal and coastal to fully continental deposition, respectively, during the Late Cretaceous-Palaeocene interval in the southern Pyrenees. They record a marine regression that began near the CampanianMaastrichtian boundary. In the Tremp Formation four informal lithostratigraphic units have been distinguished (Rosell et al., 2001) (Fig. 1). Dinosaurs bearing sites occur in the two lower units: the
“grey unit” and in the “lower red unit”. The first one consists in grey
marls with abundant invertebrates that usually are interbedded with layers of coal seams, limestones with charophytes and sandstones beds. It deposited in lagoonal and coastal wetland settings with variable salinity that laterally evolve to a barrier-island. The age ranges from the earliest to the latest Maastrichtian.
1Institut Català de Paleontologia Miquel Crusafont, C/ Escola Industrial 23, 08201, Sabadell, Catalonia, Spain.
[email protected]; [email protected]; [email protected]; [email protected]
2Grupo Aragosaurus-IUCA, Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009, Zaragoza, Spain.
jicanudo@uniza r . es; bernat.vila@uniza r . es; penelope@uniza r . es
3Departament de Geologia, Universitat Autònoma de Barcelona, 08193, Cerdanyola del V a llès, Catalonia, Spain.
[email protected]; [email protected]
4Museu de la Conca Dellà,
C/ del Museu 4, 25650, Isona, Catalonia, Spain. [email protected]
The outcrops of the Aren and Tremp Formations in the southern Pyrenees, which are located in the Aragón and Catalunya communities, have yielded the most important collection of Late Cretaceous dinosaur remains of Europe. Bones, ichnites and eggs are found in a wide exposure that extends over one hundred
kilometres. The importance of these outcrops was first noted by
Talens (1955) and Lapparent (1958) in the middle 50s, and later corroborated by other scientists in the last decades (e.g., Casanovas
et al., 1993; Sanz et al., 1995). Recent fieldworks conducted by the
Universidad de Zaragoza and the Institut Català de Paleontologia have uncovered new dinosaur sites. These new data, together with
Figure 1. Chronostratigraphy of the Tremp and Aren formations in the
southern Pyrenees (modified from Riera et al., 2009). From east to west:
Vallcebre Syncline, Coll de Nargó Syncline, Tremp Syncline, and Àger Synclines.
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The “lower red unit” is mainly made of red lutites with sandstones, lacustrine limestones and palaeosols. These facies are
interpreted as floodplain alluvial and fluvial deposits with braided
and meandering channels and palustrine-lacustrine limestones interbedded (Rosell et al., 2001). Its age is late Maastrichtian (Riera et al., 2009; Oms et al., 2007; Oms and Canudo, 2004). teeth (Torices et al., 2004; Riera et al., 2009). Peculiar eggs (Sankofa pyrenaica) from a small theropod are known from the upper Arén Formation (López-Martínez and Vicens, 2012) and Prismatoolithidae-type eggshells are known from a few sites of the “lower red unit” (Galobart, 2006).
Ornithopods
Dinosaurian fossil record
Hadrosauroids are the most abundant dinosaurs in the Arén and Tremp Formations. About sixty localities with hadrosauroid
bone remains and tracks have been identified, but no egg-sites
have been reported to date (Dalla Vecchia et al., 2011). Nearly all sites are located in the “lower red unit” whereas only a few are in the upper part of the underlying “grey unit”. The sampled record indicates high hadrosaurid diversity in the upper Maastrichtian with at least three lambeosaurines - Pararhabdodon isonensis,
Arenysaurus ardevoli and Blasisaurus canudoi – an euhadrosaurid
and an indeterminate ‘hadrosaurine’ (Prieto-Márquez et al., 2006; Pereda Suberbiola et al., 2009; Cruzado-Caballero et al., 2010a, Cruzado-Caballero et al., 2010b, Casanovas et al., 1999).
We completed a continuous stratigraphic record for the
Maastrichtian of the southern Pyrenees that provides a physical framework in which the dinosaur sites can be located.
Sauropods
Sauropod evidence include tracks and trackways from two basal levels (Fumanya and Orcau-2; Vila et al., 2005; Vila et al., 2011a) in the “grey unit” and a few sites with eggs and clutches (Font del Bullidor, Biscarri and Basturs-1, 2; Vila et al., 2010a; López-Martínez et al., 2000; Sanz et al., 1995) at the top of theArén Formation and the “grey unit” (Tremp Formation). Bone remains are scant and they occasionally occur in the upper part of the “grey
unit” and in the “lower red unit”, probably reflecting differences
in rock availability between the two units. In the “lower red unit”, the eggs and clutches are abundant (e.g. Pinyes and Els Terrers sites; Vila et al., 2010b; Vila et al., 2011b) being scarcer upwards.
Tracks are rare and they are only found near the K-Pg boundary. In
terms of sauropod diversity, at least four distinct titanosaurs forms can be distinguished in the upper part of the Tremp Formation, late Maastrichtian in age (Vila et al., 2009).
Ankylosaurs
To date, nodosaurid remains are probably the most infrequent dinosaur fossils in the south-Pyrenean basins. They include a few teeth and some isolated postcranial material (López-Martínez et al., 2000; Riera et al., 2009; Escaso et al., 2010). Neither eggs
nor tracks have been identified yet. They are always found in the
lower Maastrichtian deposits (lowermost part of the “grey unit” in the eastern Tremp Syncline), while they were never reported from the “lower red unit”.
Theropods
Conclusions
Theropod remains are rare and distributed in a few localities throughout the upper Arén Formation and Cretaceous part of Tremp Formation. They include teeth, eggshells, eggs and rarely
bones. Five different theropod taxa have been identified, at least,
on the basis of dental morphology: Coelurosauria indet., cf.
Dromaeosauridae indet., cf. Richardoestesia, cf. Euronychodon
and an indeterminate, large-sized taxon with plesiomorphic
The southern Pyrenees contain a rich paleontological record to understand the terrestrial environmental changes and biota successions
of the last five million years of the Mesozoic. Over 300 sites with dinosaur remains have been identified to date, containing titanosaur
sauropods, theropods, hadrosauroid ornithopods and nodosaurid ankylosaurians, as well as many eggs sites and thousand of tracks.
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On the basis of this fossil record, a well dated succession of dinosaurs is established. This is featured by the following
statements: first, there is clear heterogeneity in the stratigraphic
distribution of the dinosaur taxa in the southern Pyrenees. Second, dinosaur sites are less frequent in the ‘grey unit’, so most of the fossils are from the upper Maastrichtian “lower red unit” of the Tremp Formation. Third, changes in dinosaur associations along
the chronostratigraphic succession may reflect time-related events
(e.g., extinctions and colonizations) or biases (rock availability, sampling, environment, and ecology).
Latest Cretaceous of Arén (Huesca, Spain). Canadian Journal
of Earth Sciences, 47 (12): 1507-1517.
CRUZADO-CABALLERO, P., RUIZ-OMEÑACA, J.I. and
CANUDO, J.I. 2010b. Evidencias de la coexistencia de hadrosaurinos y lambeosaurinos en el Maastrichtiano superior de la Península Ibérica (Arén, Huesca, España). Ameghiniana, 47(2): 153-164.
DALLA VECCHIA, F.M., GAETE, R., RIERA, V., OMS, O.,
PRIETO-MÁRQUEZ, A., VILA, A., GARCIA SELLéS, A. and GALOBART, A. 2011. The hadrosaurid record in the Maastrichtian of the Eastern Tremp Syncline (Northern Spain).
In: Hadrosaur Symposium at the Royal Tyrrell Museum of
Palaeontology. Abstract V o lume: 38-44.
The abundance and diversity of dinosaur fossils in the upper
Maastrichtian of the Pyrenees has a great potential to improve our knowledge of the extinction pattern of continental vertebrates at the Cretaceous – Palaeogene boundary in Europe.
ESCASO, F., PéREZ-GARCÍA, A., ORTEGA, F. and SANZ, J.L.
2010. Ankylosaurian evidence from the Upper Cretaceous of South Central Pyrennees (Lleida, Spain): a reappraisal. In: 8
EAVP Meeting, Aix-en-Provence 2010. Abstract V o lume: 33.
GALOBART, A. 2006. Importancia del registro español de huevos
de dinosaurio. In: Los dinosaurios en el siglo XXI, Nuevas respuestas al inagotable enigma de los dinosaurios, (J.L. Sanz,
Ed). Colección Metatemas, Tusquets Editores, Barcelona, 99, 98-119 p.
Acknowledgements
We would like to thank the Projects of the Subdirección
general de Proyectos de Investigació, Ministerio de Economía y Competitividad: CGL2011-30069-C02-01/02 and CGL2010- 16447.BV acknowledges support from the Ministerio de Ciencia e Innovación (Subprograma Juan de la Cierva (MICINN-JDC) 2011).
LAPPARENT, A.F. 1958. Découverte d’un gisement d’oeufs de
Dinosauriens dans le Crétacé supérieur du bassin de Tremp
(Province de Lérida, Espagne). Comptes Rendus de l ’ A cadémie
des Sciences de Paris: 1879-1880.
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