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Geologic Time Scale Bookmark

Geologic eras, periods, and epochs listed with their date ranges

Every student of geology needs a handy reference to the geologic time scale. Download and print a new, double-sided bookmark that shows a simplified time scale from the Precambrian to the present. For a bit more detail, there is a 2-page fact sheet.

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What was the Largest Volcanic Eruption of the 20th Century?
Do you know the answer? The eruption occurred 100 years ago this April and was one of the three largest eruptions in recorded history. Additional information is here.

New Earthquake Map
The USGS has a new real-time earthquake map. Check it out!

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