Ask the Chatbot Games & Quizzes ProCon History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture Money Videos
Ypresian Stage
Table of Contents
Introduction References & Edit History Related Topics
Images
Paleogene Period in geologic time geologic time
Related Questions
Read Next
Earth from space. Full-hemisphere views of the Earth showing Hurricane Linda at its peak approaching Baja California on 1997 September 11.
What Is Earth’s Velocity?
Solar system illustration. (planets; sun)
Why Are Planets Round?
Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles
Why Is Pluto No Longer a Planet?
Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.
Is Earth Going to Change the Direction in Which It Rotates?
Solar system illustration. (Sun; planets)
A Model of the Cosmos
Discover
Thanksgiving Celebration Traditional Dinner Setting Food Concept
Why Is Thanksgiving in the U.S. Celebrated on a Thursday?
Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway
Flags That Look Alike
Iraqi Army Soldiers from the 9th Mechanized Division learning to operate and maintain M1A1 Abrams Main Battle Tanks at Besmaya Combat Training Center, Baghdad, Iraq, 2011. Military training. Iraq war. U.S. Army
8 Deadliest Wars of the 21st Century
Thanksgiving Turkey with all the sides
Why Do We Eat Turkey on Thanksgiving?
Santa Claus flying in his sleigh, christmas, reindeer
Was Santa Claus a Real Person?
Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that
America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Paleogene Period in geologic time
Paleogene Period in geologic time The Paleogene Period and its subdivisions.

Ypresian Stage

stratigraphy
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style
Share
Share to social media
URL
https://www.britannica.com/science/Ypresian-Stage
Feedback
Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login).
Thank you for your feedback

Our editors will review what you’ve submitted and determine whether to revise the article.

External Websites
Written and fact-checked by
The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.
The Editors of Encyclopaedia Britannica
Article History

Ypresian Stage, oldest division of Eocene rocks, representing all rocks deposited worldwide during the Ypresian Age (56 million to 47.8 million years ago) of the Paleogene Period (66 million to 23 million years ago). The Ypresian Stage is named for exposures in the region of Ypres, Belgium.

The Global Stratotype Section and Point (GSSP) defining the lower boundary of this stage, ratified by the International Commission on Stratigraphy (ICS) in 2003, is located within the Dababiya Section approximately 25 km (16 miles) south of Luxor, Egypt. The lower boundary of the Ypresian Stage coincides with the base of the dinoflagellate (single-celled, aquatic organisms with two dissimilar flagellae and exhibiting traits of both plants and animals) Apectodinium augustum. The upper boundary matches the first occurrence of the foraminiferan (pseudopod-using unicellular organism protected by a test or shell) Hantkenina nuttalli. The Ypresian Stage precedes the Lutetian Stage and overlies the Thanetian Stage.

This article was most recently revised and updated by John P. Rafferty.