The geologic time scale is divided into eons ... such as the transition from Jurassic to Cretaceous 145.5 million years ago. The largest extinction events define a change in era. The end of the ...

It lasted a long time, nearly 80 million years, making it the longest geological ... covered in thick, scale-like leaves with sharp edges. The group this plant belongs to was at its most diverse ...

For the first time ... geological data to synchronize geological climate archives from the South Atlantic and the Northwest ...