Vertebrate assemblages from the early Late Cretaceous of southeastern Morocco: An overview

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	Vertebrate assemblages from the early Late Cretaceous of southeastern Morocco: An overview
	Cavin, L.1; Tong, H.2; Boudad, L.3; Meister, C.1; Puiz, A.1; Tabouelle, J.4; Aarab, M.3; Amiot, R.5; Buffetaut, E.2; Dyke, G.6
刊名	JOURNAL OF AFRICAN EARTH SCIENCES
	2010-07-01
卷号	57 期号:5 页码:391-412
关键词	Africa Mesozoic Vertebrata Palaeoecology Palaeogeography
文献子类	Review
英文摘要	Fossils of vertebrates have been found in great abundance in the continental and marine early Late Cretaceous sediments of Southeastern Morocco for more than 50 years. About 80 vertebrate taxa have so far been recorded from this region, many of which were recognised and diagnosed for the first time based on specimens recovered from these sediments. In this paper, we use published data together with new field data to present an updated overview of Moroccan early Late Cretaceous vertebrate assemblages. The Cretaceous series we have studied encompasses three Formations, the Ifezouane and Aoufous Formations, which are continental and deltaic in origin and are often grouped under the name "Kem Kern beds", and the Akrabou Formation which is marine in origin. New field observations allow us to place four recognised vertebrate clusters, corresponding to one compound assemblage and three assemblages, within a general temporal framework. In particular, two ammonite bioevents characterise the lower part of the Upper Cenomanian (Calycoceras guerangeri Zone) at the base of the Akrabou Formation and the upper part of the Lower Turonian (Mammites nodosoides Zone), that may extend into the Middle Turonian within the Akrabou Formation, and allow for more accurate dating of the marine sequence in the study area. We are not yet able to distinguish a specific assemblage that characterises the Ifezouane Formation when compared to the similar Aoufous Formation, and as a result we regard the oldest of the four vertebrate "assemblages" in this region to be the compound assemblage of the "Kem Kern beds". This well-known vertebrate assemblage comprises a mixture of terrestrial (and aerial), freshwater and brackish vertebrates. The archosaur component of this fauna appears to show an intriguingly high proportion of large-bodied carnivorous taxa, which may indicate a peculiar trophic chain, although collecting biases alter this palaeontological signal. A small and restricted assemblage, the OT1 assemblage, possibly corresponds to a specific, localised ecosystem within the Kern Kern beds compound assemblage. Microfossils and facies from the Aoufous Formation, corresponding to the top of the compound assemblage, provide evidence of extremely abiotic conditions (hypersalinity), and thus of great environmental instability. At the base of the Akrabou Formation the first ammonite bioevent, Neolobites, corresponds to the onset of the marine transgression in the early Late Cenomanian while the Agoult assemblage (Late Cenomanian?) contains a variety of small fish species that have Central Tethyan affinities. Finally, the youngest Mammites bioevent in the late Early Turonian corresponds to a deepening of the marine environment: this sequence is isochronous with the Goulmima assemblage, a diverse collection of fish and other marine taxa, and shows affinities with taxa from the South Atlantic, the Central Tethys and the Western Interior seaway of North America, and further highlights the biogeographical importance of these North African Late Cretaceous assemblages. (C) 2009 Elsevier Ltd. All rights reserved.
WOS关键词	CENOMANIAN-TURONIAN BOUNDARY ; SOUTHWESTERN FRANCE ; FOSSIL VERTEBRATES ; IULLEMMEDEN BASIN ; SOUTHERN TUNISIA ; AMMONITE FAUNAS ; WESTERN DESERT ; HIGH ATLAS ; EVOLUTION ; TELEOSTEI
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000279091100001
内容类型	期刊论文
源URL	[http://124.16.247.212/handle/311034/7636]
专题	古脊椎动物与古人类研究所_图书馆1
作者单位	1.Museum Geneve, Dpt Geol & Paleontol, CH-1211 Geneva 6, Switzerland 2.Ecole Normale Super, Geol Lab, CNRS, UMR 8538, F-75231 Paris 05, France 3.Fac Sci & Tech, Boutalamine, Errachidia, Morocco 4.Musee Municipal, F-76500 Elbeuf Sur Seine, France 5.Chinese Acad Sci, IVPP, Beijing 100044, Peoples R China 6.Univ Coll Dublin, Sch Biol & Environm Sci, Dublin 4, Ireland 7.Musee Dinosaures, F-11260 Esperaza, France
推荐引用方式 GB/T 7714	Cavin, L.,Tong, H.,Boudad, L.,et al. Vertebrate assemblages from the early Late Cretaceous of southeastern Morocco: An overview[J]. JOURNAL OF AFRICAN EARTH SCIENCES,2010,57(5):391-412.
APA	Cavin, L..,Tong, H..,Boudad, L..,Meister, C..,Puiz, A..,...&Le Loeuff, J..(2010).Vertebrate assemblages from the early Late Cretaceous of southeastern Morocco: An overview.JOURNAL OF AFRICAN EARTH SCIENCES,57(5),391-412.
MLA	Cavin, L.,et al."Vertebrate assemblages from the early Late Cretaceous of southeastern Morocco: An overview".JOURNAL OF AFRICAN EARTH SCIENCES 57.5(2010):391-412.