Stevns Klint
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How it came to be
Stevns Klint, a white chalk cliff on the east coast of Zealand in Denmark, runs along the coast. It exposes rock from the end of the Cretaceous and the start of the Paleogene, and the boundary between them shows as a dark clay layer, the fiskeler, five to ten centimetres thick.
The clay is rich in iridium and became evidence for the theory that the Chicxulub asteroid, which struck off Mexico's Yucatán Peninsula at the end of the Cretaceous, wiped out more than half of all life on Earth. More than 830 species of larger fossils have been found in the cliff, and it was the first known site to show that ammonites survived for a short time after the boundary.
In 1953 the Cold War fortress of Stevnsfortet was dug into the cliff, and it has been open as a museum since 2008. The cliff was inscribed in 2014.
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