The middle and upper Eocene marine sediments in the Sierras exteriores (Prepyrenes) are stu- died. Severa/ depositional sequences are recognized: Calizas de Guara Formation (SDI, SD2 and SD3), Margas de Arguis Formation (SD4,SD5 and Iower part of SD6) ahd Belsue-Atares Formation (SD6). Tentatively these sequences are correlated with the eustatic global cycles and their tectonic influence are analized
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