The glaciers grew into ice sheets. And that helped drive the temperature of the entire world to be much cooler. Now, this was a long-term trend then that continued to happen for many tens of millions living in the Cretaceous period . So by the end of the Cretaceous, you would have had some birds that could sound like the birds of today. But it is really just one clue. We need to learn so
And so, for me also-- I mean, I've been married for a certain number of years, going up on 20 years now. I'm Cretaceous period . You know?
which dinosaurs were firmly in control, even though it wouldn't last a whole lot longer. If you woke up on the last day of the Cretaceous period 66 million years ago, you would have woken up to a world thrown into turmoil. This was an asteroid, and not just any asteroid, the biggest asteroid that was sniffing around our part of the solar system over the last 500 million years. It was about six miles wide, about 10 kilometers wide or so, so a pretty sizable rock, and it smashed into
And all the bite marks are on one bone, the humerus, the upper arm bone. - Yeah. - from the early Cretaceous period , about 112 million years ago, found in what is now Alberta, Canada. Amazing.
middle of the mountains. Even the roads leading here have had to be carved out of the hills. It's the biggest thing to happen to the Western Ghats since the cretaceous period ." So you can imagine how weird it was for me to turn up, to drive for two hours in the night and then turn up in the middle of a hill and be eating omelets in an American diner with pitch black all around me and nobody there because the workers had
And number five, that's the most famous, most popular, if you will. And that is the extinction event that did in the dinosaurs and a lot of other groups at the end of the Cretaceous Period . And there's a pretty broad scientific consensus that that was caused by an asteroid impact.
But these are the mammals that give birth to tiny little babies that are born very premature, that then develop more further in their mother's pouch. So these are the three major types of mammals. Placental mammals are the dominant ones today. But we see the roots of these three major groups back in the Cretaceous period . Now what we see in the fossil record is that those features didn't just evolve in one burst. They evolved one by one over time in many ancestors.
is we never find a fossil of a T-rex the size of a mouse, a triceratops the size of a shrewd. Mammals were the ones that were being very good at being small. Now, during the Cretaceous period , there was this burst of evolution, not just of mammals, but of lots of other species, that we call the Cretaceous terrestrial revolution. It's a bit of a bombastic term, maybe. But in many ways, it was revolutionary because it touched so many aspects of life and of food webs and of ecosystems. And
The glaciers grew into ice sheets. And that helped drive the temperature of the entire world to be much cooler. Now, this was a long-term trend then that continued to happen for many tens of millions the forest now that they could fly. But by the end of this all, by the end of the Cretaceous period , the time of T-Rex, the time of Triceratops, there were a whole bunch of birds flying overhead of
That's perfect sewage. Have ethanol, and then it evaporates. But then about 100 million years later-- sorry, about 50 million years later, 100 million years ago, in the Cretaceous period , the fruity plants take over from the pine trees, the fruiting flowering plants.