出典:Wiktionary
出典:『Wiktionary』 (2026/03/02 21:01 UTC 版)
This period was first recognized from boreholes in the area of the city of Amersfoort, Utrecht province, Netherlands, by Pieter Harting (1875). He named the beds "Système Eémien" after the river Eem on which Amersfoort is located.
the Eemian