Journal
ANNALES DE PALEONTOLOGIE
Volume 96, Issue 3, Pages 117-133Publisher
MASSON EDITEUR
DOI: 10.1016/j.annpal.2011.04.001
Keywords
Charophytes; Palaeoecology; Palaeobiogeography; Kebar Formation; Lower Cretaceous; Tunisia
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In Tunisia, in the platform domain, the Aptian-Albian transition is associated with a major stratigraphic gap not precisely dated, which is related to the subaerial exposure of the Aptian Orbata platform. Locally, in central Tunisia (Jebel Kebar), this gap is substituted by the sedimentary records of the Kebar Formation. This formation provided a rich association of fossil charophytes, formed by Atopochara trivolvis trivolvis, Clavator harrisii zavialensis and Sphaerochara verticillata which allows attributing it to the late Aptian early Albian interval (most probably early Albian). In addition, a new variety, Sphaerochara verticillata var. kebariensis, is described. The charophyte assemblage shows significant biogeographic affinities with a coeval flora found in the Iberian Peninsula. The Kebar Formation was previously regarded as exclusively nonmarine, but the presence of the assemblage of charophytes and associated ostracods described rather indicates a fluctuation between margino-littoral (lagoonal) and continental environments. (C) 2011 Elsevier Masson SAS. All rights reserved.
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