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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde

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Foss. Rec., 15, 61-75, 2012
https://doi.org/10.1002/mmng.201200004
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
01 Aug 2012
Palaeogeography and palaeoecology of early Floian (Early Ordovician) cephalopods from the Upper Fezouata Formation, Anti-Atlas, Morocco
B. Kröger1 and B. Lefebvre2 1Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstr. 43, 10115 Berlin, Germany
2Laboratoire de Géologie de Lyon “Terre, Planètes et Environnement”, UMR CNRS 5276, Université Lyon 1 & ENS-Lyon, Géode, 2 rue Raphaël Dubois, 69622 Villeurbanne cedex, France
Abstract. In the central Anti-Atlas (Morocco), the Early Ordovician succession consists of about 1000 m of fossiliferous argillites and siltstones. The Upper Fezouata Formation (Floian) contains a comparatively rich and abundant cephalopod association. A small collection of these cephalopods is described herein for the first time. The cephalopods are interpreted as autochthonous or parautochthonous, representing a fauna, which originally lived nektobenthically in the open water above the sediments or related to the sea bottom. The cephalopod associations of the Upper Fezouata Formation are similar to other contemporaneous assemblages known from higher palaeolatitudes and associated with deeper depositional settings and in siliciclastically dominated deposits. They are composed almost exclusively of slender orthocones, in this case predominantly of Destombesiceras zagorense n. gen., n. sp., which is interpreted as an early discosorid. Bathmoceras australe Teichert, 1939 and Bathmoceras taichoutense n. sp. from the Upper Fezouata Formation are at present the earliest unambiguous occurrences of bathmocerid cephalopods. Epizoans on the shell of a specimen of Rioceras are the earliest evidence of bryozoans growing as potential hitchhikers on cephalopod shells, indicating an early exploitation of a pseudoplanktonic lifestyle in this phylum.

doi:10.1002/mmng.201200004


Citation: Kröger, B. and Lefebvre, B.: Palaeogeography and palaeoecology of early Floian (Early Ordovician) cephalopods from the Upper Fezouata Formation, Anti-Atlas, Morocco, Foss. Rec., 15, 61-75, https://doi.org/10.1002/mmng.201200004, 2012.
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