Geologic Time Chart

Ma (Mega-annum) means Millions of Years Ago

ERA or EON	PERIOD	EPOCH	Ma
CENOZOIC ERA 65 Ma to Present	Quaternary	Holocene Pleistocene	.01 1.8
	Tertiary	Pliocene	5.3
		Miocene	23
		Oligocene	34
		Eocene	56
		Paleocene	65
	_______________
MESOZOIC ERA 251-65 Ma	Cretaceous		146
	Jurassic		200
	Triassic		251
	_______________
PALEOZOIC ERA	Permian		299
542-251 Ma	Pennsylvanian		318
	Mississippian		359
	Devonian		416
	Silurian		444
	Ordovician		488
	Cambrian		542
	_______________
PROTEROZOIC EON	Vendian or Ediacarian		600
2500-542 Ma	Proterozoic		2500
	_______________
ARCHEAN EON			Date Undefined

The Phanerozoic Eon (543 Ma to Present) comprises the Paleozoic, Mesozoic, and Cenozoic Eras.
The Proterozoic plus the Archean may be called simply Precambrian Time.
The Earth was formed about 4,550 Ma, but the earliest known rocks are less than 4,000 Ma.
The interval from 4,550 Ma to about 4,000 Ma is sometimes known as the Hadian Eon.

This chart was modified from the 2004 time scale of the
International Commission on Stratigraphy, and other sources.

Geologic Time Chart

Ma (Mega-annum) means Millions of Years Ago

ERA or EON

PERIOD

EPOCH

Ma

CENOZOIC ERA 65 Ma to Present

Quaternary

Holocene Pleistocene

.01 1.8

_______________

MESOZOIC ERA 251-65 Ma

PALEOZOIC ERA

PROTEROZOIC EON

Images, art and text copyright © Dave Thayer, 2008 None of this material may be used for commercial purposes without written permission of the author.

CENOZOIC ERA
65 Ma to Present

Holocene
Pleistocene

.01
1.8

MESOZOIC ERA
251-65 Ma

Images, art and text copyright © Dave Thayer, 2008
None of this material may be used for commercial purposes without written permission of the author.