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 ...

where we found a connection to a time long before human beings walked the Earth. It’s a story of how the geology of the Cretaceous Period, between 70 and 100 Million years ago, emphatically ...