Some say the iridium layer and the strange rock clues could also point to volcanic activity instead. Volcanoes went wild during the last 40 million years of the dinosaurs’ reign.

Scientists have discovered levels of iridium 30 times greater than average in the Cretaceous/Tertiary (KT) boundary, the layer of sedimentary rock laid down at the time of the dinosaur extinction ...

Spikes of iridium in dust from this time have been found in over 100 places around the world from America, Asia, Europe, Oceania, all the way to Antarctica. These were first identified in findings ...

Fast forward to the 1980s, and scientists uncovered traces of asteroid dust, finding it scattered around the globe within the same geological layer that corresponds to the dinosaurs’ extinction.