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Mustapha Mroueh, Lebanese University (Lebanon)
Carla Muller, Free lancer (France)
Eric Barrier, Pierre et Marie Curie University (France)
Catherine Homberg, Pierre et Marie Curie University (France)
Georges Aoun, Lebanese University (Lebanon)
Hassan Jaafar, Ministery of Energy and Water (Lebanon)
Walid Hamdan, Lebanese University (Lebanon)
Fathi Hijazi, Lebanese University (Lebanon)
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The stratigraphy of the Cenozoic formations of Lebanon was the subject of intensive studies.
The aim of this project was to correlate and subdivide the Cenozoic calcareous rocks. The work was concentrated on the analysis and subdivision of the upper Meso-Cenozoic formations in a frame of the tectonic development of the country. These formations were mainly found in southern part of Lebanon and in western Bekaa, with few outcrops in the upper most northern Lebanese areas. The studied sedimentary layers were represented by a succession of white-yellowish hard limestone with white-yellowish, in some areas bituminous, marl and white slithly friable chalky marl.
The episode of extension, of the tectonic development of the country, occurred mainly during the Cenozoic.However,the sedimentary cover of the said sequences, represented by thick marl layers, chalky,marly limestone were carefully studied.
The examination of these sequences, reveals the presence of nanofossil organisms.The careful analysis of the Nanofossils, indicates that these sequences are of Palcene,Eocene,Oligocene and Lower Miocene age.The Oligocene was discovered in the first time in Lebanon.
On the basis of this discovery, the new stratigraphic boundaries, in the present time, were frequently traced on the sheets of the geological map of Lebanon 1/20000, wherever these sequences, where found.
Key words: Paleocene, Oligocene, Miocene,Limestone, Chalk, Marl, Nanofossils
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