General Knowledge – Geological Time Scale – Notes For W.B.C.S. Examination.
সাধারণ জ্ঞান – ভূতাত্ত্বিক সময় স্কেল – WBCS পরীক্ষার জন্য নোট।
The following table describes Geological Time Scale in brief.Continue Reading General Knowledge – Geological Time Scale – Notes For W.B.C.S. Examination.
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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