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But some skeptics believe that the dinosaurs were already on a sharp decline, or even extinct, when the asteroid hit. This would have been thanks to climate change, unpredictable sea levels and intense volcanic activity. This dissenting theory has come to prominence because no fossils have even been found within three meters of the Cretaceous-Tertiary (K-T) boundary — an area in the sedimentary rock that’s packed with rare elements like Iridium and Quartz, which signifies when the asteroid impacted the planet. This newly discovered brow horn was found just 13cm below that all-important line. It proves that this Ceratopsian dinosaur (probably a Triceratops or Torosaurus) was wandering about right up to the impact event, and the authors believe this debunks the dissenting theory.