Abstract
Several allochthonous units were discovered during geologic reconnaissance in 1958-59 north and northeast of Algeciras, Spain. At the base is the Estepona Flysch, comprising upper Oligocene and Miocene deposits. Above this are the Algeciras unit, consisting of upper Eocene and Oligocene Flysch deposits, and the Camarote unit, composed of Tithonian (Jurassic) and lower Cretaceous sandy marls. At the top are the Aljibe sandstone on the west (Oligocene) and the Argueelles unit on the east (upper Cretaceous to middle Oligocene limestones). Most of these units originated in Ultrabetic regions.

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