Sir David Attenborough has described the "extraordinary" nature of new scientific evidence about the last day of the dinosaurs. The broadcaster and naturalist has been filming for his new BBC documentary at the Tanis fossil site in the US state of North Dakota.
His latest project highlights fossilised remains of a Thescelosaurus believed by scientists to have been killed by the Chicxulub asteroid 66 million years ago. A fragment of the 12km-wide rock may also have been found, preserved within a tiny spherule of clay – a deposit formed after a meteorite impact.
Sir David, who alongside his team was granted exclusive access to the site, said: "The film is about the last day the dinosaurs lived on Earth – and the minute by minute detail of that day. We tend to think that the end of a [geological] period extends over decades, if not centuries, and actually the end of a period may vary around the world in different areas.
