Palaeogene

Eon	Era	Period		Epoch	Start Million years ago
Phanerozoic	Cainozoic	Quaternary		Holocene	0.0117
		Quaternary		Pleistocene	2.588
		Tertiary	Neogene	Pliocene	5.333
			Neogene	Miocene	23.03
			Palaeogene	Oligocene	33.9
				Eocene	56
				Palaeocene	66
	Mesozoic	Cretaceous		Upper Cretaceous	100.5

50 million years ago during the Eocene

The Palaeogene is the first geological sub-period in the Tertiary. It is composed of three stages: Palaeocene, Eocene and Oligocene.

Related Pages [change]

Precambrian (4.567 gya – 541 mya)
In the left column are Eons, bold are Eras, not bold are Periods. gya = billion years ago, mya = million years ago
Hadean (4.567 gya – 4 gya)
Archaean (4 gya – 2.5 gya)
Proterozoic (4 gya – 2.5 gya)	Palaeoproterozoic (2.5 gya – 1.6 gya) Mesoproterozoic (1.6 gya – 1 gya) Neoproterozoic (1 gya - 541 mya) Tonian (1 gya – 850 mya) Cryogenian (850 mya – 635 mya) Ediacaran (635 mya – 541 mya)

Phanerozoic (541 mya – today)
In the left column are Eras, bold are Periods, not bold or italics are Epochs, Italics are stages. kya = thousand years ago, mya = million years ago
Palaeozoic (541 mya – 252.17 mya)	Cambrian (541 mya – 485.4 mya) Ordovician (485.4 mya – 443.4 mya) Silurian (443.4 mya – 419.2 mya) Devonian (419.2 mya – 358.9 mya) Carboniferous (358.9 mya – 298.9 mya) Mississippian (358.9 mya – 323.2 mya) Pennsylvanian (323.2 mya – 298.9 mya) Permian (298.9 mya – 252.17 mya)
Mesozoic (252.17 mya – 66.0 mya)	Triassic (252.17 mya – 201.3 mya) Lower Triassic (252.17 mya – 247.2 mya) Middle Triassic (247.2 mya – 237 mya) Upper Triassic (237 mya – 201.3 mya) Jurassic (201.3 mya – 145 mya) Lower Jurassic (201.3 mya – 174.1 mya) Middle Jurassic (174.1 mya – 163.5 mya) Upper Jurassic (163.5 mya – 145 mya) Kimmeridgian (157.3–152.1 mya) Cretaceous (145 mya – 66.0 mya) Lower Cretaceous (145 mya – 100.5 mya) Upper Cretaceous (100.5 mya – 66.0 mya)
Cainozoic (66.0 mya – today) Tertiary (66.0 mya – 2.588 mya)	Palaeogene (66.0 mya – 23.03 mya) Palaeocene (66.0 mya – 56 mya) Eocene (56 mya - 33.9 mya) Oligocene (33.9 mya – 23.03 mya) Neogene (23.03 mya – 2.588 mya) Miocene (23.03 mya – 5.333 mya) Pliocene (5.333 mya – 2.588 mya) Quaternary (2.588 mya – today) Pleistocene (2.588 mya – 11.7 kya) Holocene (11.7 kya - today)

Source	International Chronostratigraphic Chart 2013. International Commission on Stratigraphy, retrieved 8 April 2013. Divisions of geologic time – major chronostratigraphic and geochronologic units USGS, retrieved 8 April 2013.