The following table describes Geological Time Scale in brief −
| Era | Period | Period | Age (as Million Years Ago – MYA) | Major Events |
|---|---|---|---|---|
Cenozoic It is the Age of Mammals. (about 65.5 MYA to Present Day) | Quaternary | Holocene | 0.01 MYA to present | End of the Ice Age and dominance of human beings. |
| Pleistocene | 1.6 MYA | Ice Age began and the earliest human appeared. | ||
| Tertiary | Pliocene | 5.3 MYA | Trace of human ancestors. | |
| Miocene | 23.7 MYA | Abundance of grass. | ||
| Oligocene | 36.6 MYA | Dominance of mammals. | ||
| Eocene | 57.8 MYA | Extinction incident | ||
| Paleocene | 65.5 MYA | First large mammals evidenced. | ||
Mesozoic Age of Reptiles. (about 245 MYA to 65.5 MYA | Cretaceous | Extinction of Dinosaurs | 144 MYA | Flowering plants appeared. |
| Jurassic | 208 MYA | First birds appeared. | ||
| Triassi | First Dinosaurs | 245 MYA | Reptiles were dominant and evidence of first mammals. | |
Paleozoic (about 570 MYA to 245 MYA) | Permian | Age of Amphibians | 286 MYA | |
| Carboniferous | 360 MYA | First Reptile and large fish appeared. | ||
| Devonian | Age of Fishes | 408 MYA | First land animal appeared. | |
| Silurian | 438 MYA | First insects, land plants, & jawed fish appeared. | ||
| Ordovician | 505 MYA | Extinction incident evidenced. | ||
| Cambrian | 570 MYA | First fungi evidenced. | ||
Precambrian (about 4600 MYA to 570 MYA) | Proterozoic | 2500 MYA | First multicellular life appeared. | |
| Achean | 3800 MYA | First unicellular life appeared. | ||
| Hadean | Priscoan | 4600 MYA | Earth cooled and atmosphere and Ocean formed |
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