globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.02.039
论文题名:
Palaeoecological aspects of the diversification of echinoderms in the Lower Ordovician of central Anti-Atlas, Morocco
作者: Lefebvre B.; Allaire N.; Guensburg T.E.; Hunter A.W.; Kouraïss K.; Martin E.L.O.; Nardin E.; Noailles F.; Pittet B.; Sumrall C.D.; Zamora S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 460
起始页码: 97
结束页码: 121
语种: 英语
英文关键词: Echinodermata ; Lagerstätten ; Morocco ; Ordovician ; Palaeobiogeography ; Palaeoenvironments
英文摘要: Echinoderms are one of the major components of benthic faunas in the Lower Ordovician sequence near Zagora, central Anti-Atlas, Morocco. The Fezouata Shale (Tremadocian–late Floian) has yielded numerous, exquisitely preserved echinoderm assemblages, ranging through several stratigraphic levels and palaeoenvironmental conditions. These associations offer a unique opportunity to document both evolutionary and palaeoecological aspects of echinoderm diversification in high-latitude, siliciclastic-dominated western Gondwana sediments, where rapid in situ burials facilitated excellent faunal census conditions. Lower shoreface deposits of the Fezouata Shale provide the most complete record of successive echinoderm faunas. In late Tremadocian times, these relatively shallow shelf deposits show the progressive replacement of low-diversity, opportunistic, Cambrian-like, dwarfed communities dominated by cornute stylophorans, in unhospitable, dysoxic environmental conditions by higher diversity benthic assemblages, more typical of the Great Ordovician Biodiversification Event and dominated by blastozoans, on well-oxygenated sea-floors. The turnover of the Ordovician radiation was apparently slightly delayed in more proximal settings. Eocrinoid meadows persisted in shallower environmental conditions up to the middle Floian. In the late Floian, they were replaced by diploporite-dominated communities, typical of later Ordovician high-latitude peri-Gondwanan faunas. From a palaeobiogeographic point of view, low-diversity assemblages display relatively strong affinities with cosmopolitan late Cambrian echinoderm faunas, whereas high-diversity communities are dominated by peri-Gondwanan taxa. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68268
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作者单位: UMR CNRS 5276 LGLTPE, Université Lyon 1, bâtiment Géode, 2 rue Raphaël Dubois, Villeurbanne cedex, France; UMR CNRS 8198 EcoEvoPaleo, Cité Scientifique, Université Lille 1, bâtiment SN5, Villeneuve d'Ascq, France; Physical Science Division, Rock Valley College, 3301 N. Mulford road, Rockford, IL, United States; Department of Applied Geology, Western Australian School of Mines, Curtin University, GPO Box U1987, Perth, WA, Australia; Département des Sciences de la Terre, Faculté des Sciences et Techniques-Guéliz, Université Cadi Ayyad, avenue Abdelkrim el Khattabi, BP 549, Marrakesh, Morocco; UMR CNRS-IRD-UPS 5563 Géosciences Environnement Toulouse, Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, Toulouse, France; Monash University, Clayton Campus, Building 28, Clayton, Victoria, Australia; Department of Earth and Planetary Sciences, The University of Tennessee, 1412 Circle Dr., 37996-1410TN, United States; Instituto Geológico y Minero de España, C/Manuel Lasala, 44, 9°B, Zaragoza, Spain

Recommended Citation:
Lefebvre B.,Allaire N.,Guensburg T.E.,et al. Palaeoecological aspects of the diversification of echinoderms in the Lower Ordovician of central Anti-Atlas, Morocco[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,460
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