Une Zonation du Crétacé à l'aide des Foraminifères planctoniques est proposée pour les régions méditerranéennes. L'attention est attirée particulièrement sur cette limitation géographique de la validité de l'échelle, ainsi que sur le degré de précision que l'on peut attendre dans la corrélation entre ces zones de microfossiles et les autres échelles (zones de macrofossiles, étages, échelle linéaire des âges, renversements magnétiques).

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Some sedimentary units (I to V) or sub-units will be discussed in the ecostratigraphy section of this report. The designation of sedimentary units and sub-units described in this report are unique to this study and do not apply to the designations provided by the shipboard sedimentologists. These sedimentary units comprise lithologic entities (here called lithoterms) which were partially described onboard ship and upon which we further elaborated at Lamont-Doherty Geological Observatory. The different lithoterms in a given unit roughly correspond to the successive intervals, which are usually distinguished in a sedimentary graded sequence. They have been designated differently, depending on the different units (1, 2, 3 . . . , I, II, III . . . , A, B, C. . .). In the caption of Column G of Chart 1A (back pocket, this volume), these letters and Arabic or Roman numbers have been inserted from one unit to 287