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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Using your understading of rock units, describe the rock units near Ohio (as an example) .

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

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• Geologic Maps and Mapping -USGS
  Learn more about how to understand geologic maps.
• Reading Geologic Maps, About.com
  Follow this tutorial on how to read and use geologic maps.
• National Cooperative Geologic Mapping Program - USGS
  Read and explanation of how geologic features and rock units are shown on geologic maps.

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• Grand Canyon Explorer
  Read about such topics as: how was it formed?; where did all the rock come from?; why does it look like it does?; when did all this happen?

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• Atlas of Igneous and Metamorphic Rocks, Minerals, and Textures - University of North Carolina
  See examples of plutonic (intrusive igneous rocks) and volcanic (extrusive igneous rocks) textures.

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• Atlas of Igneous and Metamorphic Rocks, Minerals, and Textures
  See examples of different microtextures of metamorphic rocks.

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