Ypresian significant event Paleocene–Eocene Thermal Maximum
Events
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 the Ypresian.The Ypresian is also marked by another warming event called the Early Eocene Climatic Optimum (EECO). The EECO is the longest sustained warming event in the cenozoic record; it lasted about 2–3 million years between 53 and 50 Ma. The interval is characterized by low oxygen 18 isotopes, high levels of atmospheric pCO2, and low meridional thermal gradients. Biodiversity has been reported to have been significantly impacted by the conditions prevalent during the EECO. For instance, there were biotic turnovers among marine producers such as calcerous nannofossil among others etc.