It would be a real good idea to understand the following terms and concepts...
The "laws" of geology
Uniformity: the present is the key to the past
Original Horizontality: sedimentary layers are initially deposited in horizontal layers
Superposition: the layer on the bottom is the oldest, and they get younger as they pile up.
Cross-cutting relationships: the thing being cut is older that the thing doing the cutting
The Laws of GeoFantasy
Relative age dating
Absolute age dating
Go to the "Ask GeoMan" Index of Questions
Return to GeoMan's Home Page