Gómez Alday, Juan JoséGarcía Garmilla, FranciscoElorza, Javier2015-03-262015-03-261998http://hdl.handle.net/10272/10180Upper Cretaceous inoceramid bivalves and belemnite rostra from three sections (Aquitaine, Pays de Caux and NE Ardennes) are petrologically and geochemically analysed. The coarse prismatic calcite of the inoceramid shells has undergone diagenetic alteration without substantial textural changes in the original microstructure. Inoceramid oxygen isotope ratios together with a generalised bright red-yellowish cathodoluminescence colour indicate that this type of shells have been more affected by diagenesis than belemnite rostra. Belemnite calcitic rostra better retain the primary environmental isotopic signal and turn out to be the most promising organisms as regards the study of palaeoenvironmental conditions in this faciesspaAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/BelemnitesChalkDiagenesisInoceramidsUpper CretaceousInocerâmidos y belemnites del Cretâcico Superior en facies de la creta (Aquitania, Pays de Caux, NE Ardenas): diferente comportamiento frente a la diagénesisInoceramids and belemnites of the Upper Cretaceous chalk facies (Aquitaine, Pays de Caux, NE Ardennes): their different behaviour in relation to diagenesisjournal articleopen access