NDLI: Lochkovian bivalves of Bohemian type from the eastern Anti-Atlas (Lower Devonian, Morocco)

Content Provider	Springer Nature Link
Author	Kříž, Jiří
Copyright Year	2000
Abstract	32 species of bivales are desribed from the lowermost Devonian of the eastern Anti-Atlas, Morocco. The majority of the species are closely related to the species described from Perunica (Prague Basin, Bohemia) and the Northern Gondwana marginal regions (Sardinia, Massif Armoricain, and the Carnic Alps). Two new species (Panenka hollardi n. sp. andVevoda tada n. sp.) are characteristic to the Anti-Atlas. The bivalve dominated communities, known also from Bohemia, Sardinia, Massif Armoricain, and the Carnic Alps are closely related to the cephalopod limestone biofacies and micritic limestone facies. In practice they may be used for the correlation with Perunica and other Gondwanan European basins. Analyses of the Bivalve dominated communities shows that the development of the Anti-Atlas during the Lower Devonian, Lochkovian was very similar to other Northern Gondwana regions and that the distance between Perunica and Northern Gondwana was much smaller than it has been interpreted on the basis of paleomagnetic measurements. In Gondwanan Europe and in Perunica the Silurian type cephalopod limestone facies is developed only up to the lowermost Lochkovian. In Morocco, the cephalopod limestone facies of this type is developed in several other levels higher in the Devonian, at least up to the upper Lochkovian. This may be caused by the paleogeographic position of Morocco during the Lower Devonian being in the same position as the Gondwanan Massif Armoricain, Sardinia, Carnic Alps and Perunican Prague Basin were during the Silurian. They all shifted together during the Lower Devonian to the equatorial region while Morocco changed its position to the temperate region just south of the equatorial region.In dieser Arbeit werden aus Ablagerungen des untersten Devons vom östlichen Anti-Atlas, Marokko, 32 Arten von Bivalven beschrieben. Die meisten Arten zeigen enge Beziehungen zu den aus Perunica (Prager Becken, Böhmen) und aus den Randgebieten von Nordgondwana (Sardinien, Karnische Alpen und Armorikanisches Massiv) beschriebenen Arten. Zwei neue Arten (Panenka hollardi n. sp. undVevoda tada n. sp.) sind typisch für den Anti-Atlas. Die von Bivalven dominierten, auch in Böhmen, Sardinien, Karnischen Alpen und im Armorikanischen Massiv bekannten Faunengemeinschaften sind eng an die Cephalopoden-Kalkfazies und an mikritische Kalke gebunden. Sie eignen sich gut für die Korrelation mit Perunica und mit den anderen europäischen Becken von Gondwana. Die Analysen der von Bivalven dominierten Faunengemeinschaften lassen vermuten, daß die Entwicklung im Anti-Atlas während des unteren Devons, des Lochkoviums, sehr enge Beziehung zu den anderen Gebieten am Nordrand von Gondwana zeigte, und daß die Entfernung zwischen Perunica und Nordgondwana wesentlich kleiner war als dies nach den bisher interpretierten paläomagnetischen Messungen vermutet worden ist. Im gondwanischen Europa und auf Perunica ist der silurische Typ der Cephalopoden-Kalke nur im untersten Lochkovium entwickelt. In Marokko ist die Cephalopoden-Kalkfazies von diesem Typ in mehreren höheren Niveaus des Devons entwickelt, wenigstens bis zum oberen Lochkovium. Das könnte durch die paläogeographische Lage Marokkos im Unterdevon verursacht werden. Marokko könnte sich also in der gleichen Position befinden, in der sich während des Silurs das gondwanische Armorikanische Massiv, Sardinien, die Karnischen Alpen und Perunica des Prager Beckens befanden. Alle diese Gebiete wurden im Unterdevon in das äquatoriale Bereich geschoben, während Marokko seine Position ins temperierte Gebiet südlich vom äquatorialen Bereich wechselte.
Starting Page	485
Ending Page	523
Page Count	39
File Format	PDF
ISSN	00372110
Journal	Palaeobiodiversity and Palaeoenvironments
Volume Number	80
Issue Number	2
Language	German
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Bivalves taxonomy palaeoecology Lochkovian Lower Devonian stratigraphy correlation Anti-Atlas Morocco Paleontology Biodiversity Animal Systematics/Taxonomy/Biogeography Plant Systematics/Taxonomy/Biogeography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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