![American Geosciences Institute: Rock Chart [Pdf] Graphic](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "American Geosciences Institute: Rock Chart [Pdf] Graphic")
American Geosciences Institute
American Geosciences Institute: Rock Chart [Pdf]
A rock chart the describes the texture, appearance, characteristics, type, and where each is formed.
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Western Oregon University: Earth System Science: Geologic Time [Pdf]
An 81-page slideshow that looks at the principles of geology with respect to relative dating, at different concepts describing geological processes, at absolute age and radiometric dating, at the eons and eras in the geologic time scale,...