In the geologic timescale the Ypresian is the oldest age or lowest stratigraphic stage of the Eocene . It spans the time between 56 and 47.8 Ma , is preceded by the Thanetian Age (part of the Paleocene ) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the Lower Eocene (Early Eocene).
6-594: The Cambay Shale Formation is an Early Eocene -aged geologic formation in the Cambay Basin, India . It varies in thickness from a few meters on the margins of the basin to more than 2,500m in the depressions. It directly overlies the Olpad Formation and is, in turn, overlain by the Anklesvar Formation in the southern part of the basin and by Kalol Formation in the northern part of the basin. Further north,
12-824: The Cambay Shale, in its lower part, is gradually replaced by tongues of paralic-deltaic Kadi Formation and finally by Tharad Formation . Source: Ypresian The Ypresian Age begins during the throes of the Paleocene–Eocene Thermal Maximum (PETM). The Fur Formation in Denmark , the Messel shales in Germany , the Oise amber of France and Cambay amber of India are of this age. The Eocene Okanagan Highlands are an uplands subtropical to temperate series of lakes from
18-646: The Ypresian. The Ypresian is additionally marked by another warming event called the Early Eocene Climatic Optimum (EECO). The EECO is the longest sustained warming event in the Cenozoic record, lasting about 2–3 million years between 53 and 50 Ma. The interval is characterized by low oxygen-18 isotopes, high levels of atmospheric p CO 2 , and low meridional thermal gradients. Biodiversity has been reported to have been significantly impacted by
24-634: The conditions prevalent during the EECO. For instance, there were biotic turnovers among marine producers such as calcareous nannofossils among others etc. The Ypresian Stage was introduced in scientific literature by Belgian geologist André Hubert Dumont in 1850. The Ypresian is named after the Flemish city of Ypres in Belgium (spelled Ieper in Dutch). The definitions of the original stage were totally different from
30-676: The modern ones. The Ypresian shares its name with the Belgian Ieper Group (French: Groupe d'Ypres ), which has an Ypresian age. The base of the Ypresian Stage is defined at a strong negative anomaly in δ C values at the PETM . The official reference profile ( GSSP ) for the base of the Ypresian is the Dababiya profile near the Egyptian city of Luxor . Its original type section was located in
36-675: The vicinity of Ieper. The top of the Ypresian (the base of the Lutetian) is identified by the first appearance of the foraminifera genus Hantkenina in the fossil record. The Ypresian Stage overlaps the upper Neustrian and most of the Grauvian European Land Mammal Mega Zones (it spans the Mammal Paleogene zones 7 through 10. ), the Wasatchian and lower and middle Bridgerian North American Land Mammal Ages ,
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