Stevns Klint is a world-class geological site. In the centre of the white cliff is a thin, dark layer of clay. The clay contains the story of the asteroid that hit the earth 66 million years ago and destroyed half the world’s animal and plant species – including the dinosaurs.

http://www.kulturstyrelsen.dk/english/news/stevns-klint-in-denmark-has-been-added-to-the-unesco-world-heritage-list/