Daily Almanac for
Feb 9, 2012
Search: Infoplease Info search tips
Search: Biographies Bio search tips
| Share
 
Encyclopedia

Geologic Timescale
EraPeriodEpochApproximate durationApproximate number of years ago
CenozoicQuaternaryHolocene10,000 years ago to the present 
Pleistocene2.01
TertiaryPliocene112
Miocene1213
Oligocene1125
Eocene2236
Paleocene7158
MesozoicCretaceous 7165
Jurassic 54136
Triassic 35190
PaleozoicPermian 55225
Carboniferous 65280
Devonian 60345
Silurian 20405
Ordovician 75425
Cambrian 100500
Precambrian1  >4,000600

1 Not an era but the time preceding the Cambrian.

geologic timescale

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

    • Cite
    • Print
    • Bookmark

See more Encyclopedia articles on: Geology and Oceanography


Premium Partner Content
HighBeam Research
Documents Images and Maps Reference
(from Newspapers, Magazines, Journals, Newswires, Transcripts and Books)

Research our extensive archive of more than 28 million documents from 2,600 sources.

Additional search results provided by HighBeam Research, LLC. © Copyright 2005. All rights reserved.
A free, reliable Q&A site for homework help. Answerplease.com

24 X 7

Private Tutor

Click Here for Details
24 x 7 Tutor Availability
Unlimited Online Tutoring
1-on-1 Tutoring
Explore Arc Length Formula , Slope Formula