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Mass fires can be much hotter than a normal fire. Well, the leaves on the ground caught fire, leaves in the trees caught fire… The underbrush caught fire. There’s winds at hurricane speeds rushing into the fire, drawing upward into the rising flames and they consume everything. And this vapor quickly spread across the planet. Probably only took a few hours for it to reach the furthest reaches of the Earth. Thanks to our new model of what happened after the impact, we now know that fires spread right around the globe. But were these fires devastating enough to cause the extinction of all of the world’s dinosaurs in a single day? ‘To find out, I’m traveling far from the impact site ‘to the very tip of South America ‘and the remote wilderness of Patagonia.’ Over , miles away from where the asteroid hit. I am all the way down here in Chile. Now, we tend to think of this asteroid as being absolutely enormous, and it was km in diameter but in the context of the size of the Earth, that’s like a grain of sand impacting on a bowling ball. And I want to understand what kind of impact the asteroid landing here had on the dinosaurs right down here at the toe of South America. Leading the hunt for clues is palaeontologist Marcelo Leppe. He’s taking me to look for dinosaur remains in a mountain valley that’s best accessed on four legs. Marcelo, can you explain to me how the geology of this valley works? Actually, we are passing through time and we are moving to the end of the Cretaceous, to the end of the age of the dinosaurs. We are, at the moment, in million years ago, this is Campanian. So this is fantastic. As we ride along the valley, as we ride north, we’re riding from million to million years. Through time. Getting closer to that extinction event. We’ve reached the Valley of the Dinosaurs. Now I want to see what sort of dinosaurs lived here and find out what happened to them in the hours after the impact. So, shall we get off and have a look? Yeah, let’s leave the horses and look. Seems like a good idea. The place is literally full of bones. As you can see, this sunlight is the best because the angular light is reflecting the bones. Let’s see if we can find a dinosaur, then. Yeah, let’s… let’s see. Oh, for example, there. Or here. Look, just beside you. This, here? Yes, this is a dinosaur bone. Oh. That’s fantastic. They’re different color. Greyish, or white. Yeah, so what’s that, then? Oh, it looks like a vertebrae. Probably the first one. OK, so… yeah. That looks like a facet, it looks like the surface of a joint and that would be where the skull sits. Any ideas what species? Yeah, probably a hadrosaur. %. Really? Yeah. That’s your first hadrosaur, yeah? Yeah, it is. ‘This valley is now a bone bed, four miles long.’ Yes, that is a bit of fossilized bone and they’re everywhere. Scattered across this hillside. It’s just extraordinary. Once, it was home to herds of hadrosaurs. Plant-eaters up to -feet long with a distinctive duck-billed face. But did the dinosaurs down in Patagonia die on the day the asteroid hit? Thanks to the team in Bremen,