Detailed geology, microfossils, petrology

No 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.

Different tectonic styles are recognized within the Aljibe unit N of the Strait of Gibraltar [southern Spain]. The lithology of this unit and that of the basement are, to a large extent, the cause. An anticline of the Penibetic basement, against which the sandstone of the Numidian facies has accumulated in tight folds and shingle blocks, seems to have played a large role during the emplacement of the unit. Elsewhere, it [the Aljibe unit] was dislocated into separate layers which have been overturned, welded, or overthrust. The westward displacements have local N-S components.

No abstract