240 - 234
234 - 228
228 - 222
222 - 216
216 - 210
30M
240 - 210 M
6M
1st Galactic year 250 to present
Phanerozoic Era 543 - Present
Triassic Period 248 - 206
Mesozoic Era (Middle Life) 248 - 65
 
- 220 One sub-group of therapsids, the cynodonts have evolved more mammal-like characteristics.
The jaws of cynodonts resemble modern mammal jaws more closely and their teeth are multi-cusped and differentiated down the jaw. Cynodonts are the direct ancestors of all modern mammals.
- Repenomamus From eucynodonts ( cynodonts) came the first mammals. Most early mammals were small and shrew-like animals that fed on insects. Constant body temperature. All mammals have milk glands for their young.
Neocortex has evolved in mammals. This brain region is unique to mammals.
- 7 Humans in Africa