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system series step ≈ age ( mya )
higher higher higher younger
Paleogene Oligocene Chattium 23.03

Rupelium 28.1

Eocene Priobonium 33.9

Bartonium 38

lutetium 41.3

Ypresium 47.8

Paleocene Thanetium 56

Seelandium 59.2

Danium 61.6

deeper deeper deeper older

The Ypresium (mostly shortened to Ypres in German) is the lowest chronostratigraphic level of the Eocene ( Palaeogene ) in the history of the earth . The level ranges in absolute numbers ( geochronologically ) from about 56 to about 47.8 million years. The Ypresium follows the Thanetium ( Paleocene ) and is replaced by the Lutetium .

The Paleocene / Eocene temperature maximum stood at the transition from the Thanetian to the Ypresian .

Naming and history

The step was named after the city of Ypres ( Dutch: Ieper, French: Ypres) in Belgium , near which the original type locality is located. It was first described by André Hubert Dumont in 1850. However, today's stage has little in common with the section of geological history originally designated by Dumont, it encompasses a much shorter section of geological history (Steurbaut, 2006).

Definition and GSSP

The base of the stage is defined by a change in the carbon isotope ratio ("Carbon Isotope Excursion"); the end by the first appearance of the foraminifera genus Hantkenina . The reference profile (GSSP = "Global Stratotype Section and Point") is the Dababiya profile near Luxor ( Egypt ).


  • André Dumont: Report sur la carte geologique du Royaume . Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique, 16 (2): 351-373, Brussels 1850.
  • C. Dupuis, M. Aubry, E. Steurbaut, WA Berggren, K. Ouda, R. Magioncalda, BS Cramer, DV Kent, RP Speijer and C. Heilmann-Clausen: The Dababiya Quarry Section: Lithostratigraphy, clay mineralogy, geochemistry and paleontology. Micropaleontology, 49 (1): 41-59, New York 2003 ISSN  0026-2803 .
  • Felix Gradstein, Jim Ogg, Jim & Alan Smith: A Geologic timescale. Cambridge University Press 2004 ISBN 978-0-521-78673-7
  • Hans Murawski & Wilhelm Meyer: Geological dictionary . 10., rework. u. exp. Ed., 278 p., Enke Verlag, Stuttgart 1998 ISBN 3-432-84100-0 .
  • Étienne Steurbaut : Ypresian . Geologica Belgica, 9 (1-2): 73-93, Brussels 2006 ZDB -ID 1468578-4 PDF .

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