Cretaceous–Paleogene (K–Pg) boundary, Geulhem, Netherlands
The Cretaceous-Paleogene (K-Pg) boundary (previously the K-T boundary) represents one of the largest worldwide extinction events on record. Dating back to 66 million years ago, the K-Pg boundary represents the extinction of non-avian dinosaurs and many of the world’s terrestrial species. This extinction event killed three-quarters of plant and animal species on earth and is marked by high levels of iridium, a rare element on Earth but a common element in asteroids. With one finger, as seen above, you can put your finger on the remnants of three-quarters of the world’s species. It’s an incredible lesson in geology and our earth’s history in that so much can happen in a few centimeters of sediment.
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