1Relating to or denoting the most recent interglacial period of the Pleistocene in northern Europe, preceding the Weichsel glaciation.Eem represents the previous interglacial period....
The travertine of Burgtonna was formed since the Eem interglazial.
1.1 (as noun the Eemian) The Eemian interglacial or the system of deposits laid down during it.
Origin
Early 20th century: from Eem, the name of a river in the Netherlands, + -ian.