Figure 5. The electric-log curves of the La Pascua Formation display third and fourth-order sequence sets and system tracts respectively. The incised valley sedimentary fill are shown for each interval in this composite curve. The sea level curve shows the third and fourth-order cyclicity. The dimensions of the sea level excursions was calculated from the position of the tops; the thickness and lithology of the cycles interpreted from the electic logs; and the age and depositional setting interpreted from the biostratigraphy. Nomenclature is based on that described the accompanying text, used and modified from Meneven S.A. (after Reistroeffer, 2001).