Abstract
The Tiaret-Guertoufa coral-reef, dated of Middle and Upper Oxfordian p.p., is studied in the palaeotectonic and palaeogeographic context of Western Algeria. The present note puts the emphasis on: 1) the harrier-role played by this bioherm (apex reef of block) on a pelagic shoal which has separated the Tellian Basin and its Foreland; 2) the determinant action of the distensive tectonics in the control of sedimentation during this period; 3) the transgressive character, at the Oranian scale, of the carbonated episode marked by a succession of backstepping high-frequency sequences. This transgressive condensed interval (Transversarium and Bifurcation zones) may he integrated into a positive sequence (of 3rd order? in Vail's sense) which seems to reveal a general movement of eustatic rise during Oxfordian in the Tethyan domain.
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