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oldest
hadean 4540-4000 Ma
2nd oldest
archean 4000-2500 Ma
3rd oldest
proterozoic 2500-540 Ma
4 oldest (explosion of life)
cambrian 541-485 Ma
5th oldest
ordovician 485-443 Ma
6th oldest
silurian 443-419 Ma
7th oldest
devonian 419-359 Ma
8th oldest
carboniferous 359-299 Ma
9th oldest
permian 299-252 Ma
10th oldest
triassic 252-201 Ma
11th oldest
jurrasic 201-145 Ma
12th oldest
cretaceous 145-66 Ma
13th oldest
Palogene 66-23 Ma
14 oldest (newest)
neogene 23-0 (now) Ma