following the Paleozoic
.Means "recent life
This period began with a bang, when a large asteroid most likely hit what is now the Yuccatan peninsula at the end of the cretaceous, 65 million years ago. It has yet to end -- the Cenozoic era is still underway.
Composed of the tertiary and qauternery periods.
There have been no mass extinctions during this era, despite the fact that the diversity of life on Earth has continuously declined. There is now less diversity on planet Earth than there has been since life began.