Abstract
The oldest sediments of the Traras Mountains in northwestern Algeria have been analyzed palynologically. Several levels of the 'Formation des Psammites bioturbés' provide few specimens of poorly preserved acritarchs, that nevertheless allow a stratigraphic attribution of the investigated section to the Middle to Upper Ordovician, due to the presence of specimens that can be tentatively attributed to the acritarch species Orthosphaeridium bispinosum and Villosacapsula setosapellicula. This is the first biostratigraphic age assignment for pre-Silurian sediments of northwestern Algeria.
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