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Geological Time Charts
By Sarah Lane
Sep 16, 2006, 14:01 PST

The best way to remember something is to study it several times over. If you are studying geology then these geological time charts and scales will be extremely useful. Simply print out your favorite one and put it up on your wall near your desk.

Geological Timechart
This is a geological time chart of the Phanerozoic Eon.
Source:       British Geological Survey

Scroll down this page until you get to Earth’s Geologic Time Column.
Source:       University of Nebraska, Omaha

This chart includes both the Phanerozoic Eon and Precambrian Time. The Museum of Paleontology at Berkeley is a great place to get information.
Source:       University of California, Berkeley

Geological Timescale
Scroll down to about mid-page to access this colorful chart.
Source:       University of Calgary, Geology and Geophysics

The Geologic Time Scale
This chart explains what each of the designated names mean and how they came about.
Source:       USGS

Geologic Time
Click on each of the highlighted Eras and Periods for an explanation of what it represents.
Source:       USGS

Geologic Ages of Earth History
This extremely detailed chart is also available for download in a zipped Microsoft Excel worksheet version.
Source:       Jeff Poling,

Geological Time Scale
This version is not really a chart but more of an organized list of the descriptions of each time period.
Source:       The Columbus Dispatch

Geologic Time Scale
You might want to increase the magnification of this chart before printing it out as it is the most comprehensive chart available.
      The Geological Society of America

Time Scale
Get an overview of the geological time scale, Cenozoic, Mesozoic, Paleozoic, and Precambrian Eras or get downloads.
Source:       Micropaleontology press at the Museum of Natural History, N.Y.

Geological Scale
This chart includes specific earth altering events as well as the basic chart.
Source:       Washington State University

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