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The oldest deep-water sediments of the flysch units in the western part of the Betic Cordillera (southern Spain) arc red and green pelagic claystones with intercalated siliciclastic and carbonate turbidites, ranging from Berriasian to Barremian in age. Autochthonous and redeposited benthic foraminiferal assemblages were studied in outcrops of this ‘Complex à Aptychus’ Formation in the ‘Corridor de Boyar’ near Grazalema. The assemblage of the autochthonous red and green claystones is wholly comprised of agglutinated forms, reflecting deposition beneath the calcium carbonate compensation depth (CCD). Compared to coeval abyssal and deep bathyal assemblages from the NW Australian Margin (Eastern Tethys), the Polish Outer Carpathians and the North Atlantic, the assemblage from the Betic Flysch Zone is more related to its Tethyan equivalents and may represent a truly abyssal Early Cretaceous sub-CCD environment.

journal of micropalaeontology

Deep-water agglutinated foraminifera from the Lower Cretaceous (Neocomian) ‘Complex à Aptychus’ Formation (Corridor de Boyar, Betic Cordillera, southern Spain)