65 million years of life in North America / What happened after the asteroid hit. ... succumbed with the other mammals here in the Pleistocene epoch 13,000 years ago.

The largest climate change in central North America since the age of the dinosaurs 65 million years ago, a temperature drop of nearly 15 degrees Fahrenheit, is documented within the fossilized ...

Climate changes profoundly influenced the rise and fall of six distinct, successive waves of mammal species diversity in North America over the last 65 million years, shows a novel statistical ...

If we were sitting where we are today 126,000 years ago, we would be covered in ice. Seventy-five million years ago, we would be under water. And 260 million years ago, we would be taking weekend ...

However, ancient wild horses had been in North America long before that, living here from roughly 50 million to 11,000 years ago. They became extinct at the end of the last Ice Age.

"It is amazing to imagine these giant flying squirrels gliding over rhinos and mastodons," said paleontologist Joshua Samuels.

The Atlantic Ocean opened 200 million years ago, pushing North America westward. As the continent rifted away from the supercontinent Pangaea, it finally earned the name North America.

Tyrannosaurus rex ancestors would have moved from Asia to North America around 70 million years ago, researchers say. Pedro Salas/Sergey Krasovskiy Sign up for CNN’s Wonder Theory science ...

GAINESVILLE, Fla. — The largest climate change in central North America since the age of the dinosaurs 65 million years ago, a temperature drop of nearly 15 degrees Fahrenheit, is documented ...