It's About Time/AGI

Examine the geologic map and geologic cross sections of Ohio (as an example).

• Geologic Map of Ohio
• Generalized column of bedrock units in Ohio

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Research the following dating techniques.

• Geologic age: Using radioactive decay to determine geologic age
• Radiometric time scale
• Geologic time

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• Science - American Geophysical Union
  Read articles on the following topics:
  • rocks
  • water
  • air
  • space
  • life

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• Geologic Time - William Newman, USGS
  To learn more, check out this complete online manual about geologic time and the age of the Earth.
• Geologic Time Machine - University of California Berkeley
  Travel through links that will take you from 4.5 Billions years ago to the present.

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• Unconformities in the Grand Canyon - USGS
  Site includes pictures of several unconformities that are seen in the Grand Canyon.

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