The Ypresian Stage was originally introduced by Dumont (1849) to include strata of open marine clays to fine-sands, situated between the terrestrial to marginally marine Landenian and the marine Brusselian in Belgium.
LUXOR EVOLVED RAD SERIES
The Ypresian is the lowermost stage of the Eocene Series and accordingly, the base of the Ypresian also defines the base of the Eocene ( Salvador, 1994). Ogg, in Geologic Time Scale 2020, 2020 28.1.5 Ypresian 28.1.5.1 Historical overview In a larger foraminifera zonation, the position of the Ilerdian and the Cuisian occurs in between Thanetian and Lutetian ( Figure 28.8). Based on integrated stratigraphic studies, the base of the Ilerdian was recently correlated to the base of the Ypresian ( Pujalte et al., 2009 Scheibner and Speijer, 2009).
In the Tethyan realm, the Ilerdian is a regional Mediterranean stage ( Hottinger and Schaub, 1960 Plaziat, 1981) corresponding to an important phase in the evolution of the larger foraminifera which is not represented in northwest European basins. The Cuisian has been defined and used in the Paris Basin, but it was recommended to refrain from applying the term by Bignot (1981). 1993 Vandenberghe et al., 1998, 2004 Steurbaut, 2006).Ĭuisian and Ilerdian are regional stage names that have been used in parallel with the Ypresian ( Pomerol, 1981a). The Ypresian sediments in the type area are well constrained by dinocyst and calcareous nannoplankton associations, by sequence-stratigraphic analysis and magnetostratigraphy (e.g., Ali et al. The term Ypresian is derived from the town of Ieper (Dutch spelling) or Ypres (French translation), located in western Belgium. The Paniselian (named after the Mont-Panisel hill near Mons in southern Belgium), however, is a poorly defined term and became obsolete as a chronostratigraphic term ( De Geyter et al., 2006), leaving the Ypresian as it was originally defined by Dumont (1849). Dumont (1851) later assigned the upper, sandier part of this stage to a separate Paniselian Stage ( Willems et al., 1981). The Ypresian Stage was originally introduced by Dumont (1849) to include the clayey to fine-sandy shelf-facies strata lying between the terrestrial to marginally marine Landenian (see section 28.1.4.1) and the marine Brusselian (see section 28.1.6.1) in western Belgium. on the biostratigraphy, in The Geologic Time Scale, 2012 28.1.5.1 The Ypresian Stage
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