The cliffs at Højerup are also the place where the father-and-son team of scientists Luis and Walter Alvarez measured the highest level of iridium in the Cretaceous–Paleogene boundary layer, which led them to propose their hypothesis that the Cretaceous–Paleogene extinction event was caused by an impact of a large asteroid 66 million years ago.
The cliffs at Højerup are also the place where the father-and-son team of scientists Luis and Walter Alvarez measured the highest level of iridium in the Cretaceous–Paleogene boundary layer, which led them to propose their hypothesis that the Cretaceous–Paleogene extinction event was caused by an impact of a large asteroid 66 million years ago.