The Cambrian period, 541-485 million years ago, and the Ordovician period, 485-444 million years ago
The Silurian period, 444-419 million years ago
The Devonian period, 419-359 million years ago
The Carboniferous period, 359-299 million years ago
The Permian period, 299-252 million years ago
The Triassic period, 252-201 million years ago
Picnicking in Jurassic park
The Jurassic period, 201-145 million years ago
Cretaceous bloom and doom
The Cretaceous period, 145-66 million years ago
The Cenozoic era, 66 million years ago to the present day
Postscript: the buggy universe hypothesis.