-
500
Hallucigenia (541 to 485 million years ago)
Between 541.0 ± 1.0 to 485.4 ± 1.9 million years ago, the start of multi-cellular life. Ancestor of all mammals. -
Dec 15, 1000
Dimetrodon. (295–272 million years ago.)
Found 295–272 million years ago. -
Dec 15, 1500
Archaeopteryx (150.8–148 million years ago)
One of the first bird-like creatures, 150.8–148 million years ago
