General Knowledge - Geological Time Scale

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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.
	Quaternary	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.