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- Clockwise from the top:
* Artist's rendering of an asteroid a few kilometers across colliding with the Earth. Such an impact would have released the equivalent energy of several million nuclear weapons detonating simultaneously;
* Badlands near Drumheller, Alberta, where erosion has exposed the K–Pg boundary;
* Complex Cretaceous–Paleogene clay layer in the Geulhemmergroeve tunnels near Geulhem, The Netherlands ;
* Wyoming rock with an intermediate claystone layer that contains 1,000 times more iridium than the upper and lower layers. Picture taken at the San Diego Natural History Museum;
* Rajgad Fort's Citadel, an eroded hill from the Deccan Traps, which are another hypothesized cause of the K-Pg extinction event. (en)
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