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Abstract

The sequences and the depositional systems tracts of the Berriasian (nine), Valanginian (nine), Hauterivian (seven), Barremian (six, perhaps seven) and lowest Aptian (two) in the Río Argos succession near Caravaca (Southeast Spain) are delimited and their chronostratigraphic position established in terms of ammonite biochronozones. Also their position in relation to zones of planktonic fossil groups (calpionellids, dinoflagellate cysts, nannofossils) is given. Thirty-five sequences and 6 supersequences were delimited. The Río Argos succession is an ammonite-bearing cyclic alternation of coccolith limestone beds and marlstone interbeds. The sequence boundaries are correlated in detail with well-described sections in southeast France, such as the Berriasian type section near Berrias, the Broyon section (Lower Berriasian), the La Charce section (Upper Valanginian, Hauterivian) and the Angles section (Berriasian, Valanginian, type section of the Barremian). This correlation shows that in France the same number of sequence boundaries occur at the same chronostratigraphic levels. This adds faith in the reliability of the number and chronostratigraphic position of the Lower Cretaceous sequences. Special attention is given to the sedimentological interpretation of the position assigned to the sequence boundaries in such cyclic limestone marlstone successions, which is different from the one currently used in France.

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