+
PPT
Other

Western Oregon University: Earth System Science: Geologic Time [Pdf]

For Students 9th - 10th
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,...
+
Website
Other

Unconformities

For Students 9th - 10th
This resource provides information about unconformities.