%0 Journal Article
%A Aurell, Marcos
%A Fernández López, Sixto Rafael
%A Meléndez, Guillermo
%T The Middle-Upper Jurassic oolitic ironstone levelin the Iberian range (Spain). Eustatic implications.
%D 1994
%@ 0016-6995
%U https://hdl.handle.net/20.500.14352/58493
%X The oolitic ironstone level occurring at the Callovian-Oxfordian boundary across wide areas in the central IberianRange (Eastern Spain) is interpreted here as formed on an extended, very shallow to temporarily emerged, uniformcarbonate platform. Main evidence to support this interpretation comes from both sedimentological analysisof facies and taphonomic analysis of the ammonites. The sedimentological analysis gives support to the idea ofiron oolites being formed on, or in the surroundings of, emerged areas. On the other hand, the taphonomic analysisshows that some inner moulds of ammonites from this level display evidence of taphonomic reworking, such asthe presence of ellipsoidal abrasion facets on the final part of the last preserved whorl, or annular abrasionfurrows carved on the external region. These features would have developed by the action of directional currentsunder extremely shallow conditions. Bathymetric implications are relevant for the interpretation of the sea levelfluctuations at this stratigraphic interval: A relative lowstand of sea level is proposed for the Upper Callovian-LowerOxfordian interval in the studied area.
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