This paper analyzes the benthic foraminiferal assemblages present in two Upper Tortonian sections belonging to the «Arcillas de Gibraleón» Formation (Guadalquivir Basin) containing a characteristic glauconitic level. The basal samples of this horizon show both shallow-water and epibathyal taxa, a mixture also found in ostracods that may characterize the transition toward deeper conditions. In the upper samples, deep-neritic and epibathyal species are dominant, indicating a moderate-deep environment (150-300 m) in which was deposited most of the glauconitic horizon.
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