|
Sort chronologically
Earliest at the top Dinosaurs Mammals Jellyfish Birds |
c. 1 billion years ago Sponges and jellyfish drift in the sea, to be joined later by more purposeful shrimps and lobsters c. 225 million years ago The dinosaurs dominate the planet in a way that no previous creature has been able to c. 170 million years ago Mammals begin to make their appearance c. 125 million years ago Primitive birds begin to feature in the fossil record |