RELATIVE AGES OF ROCKS!
Principle of Superposition- process of reading undisturbed rock layers
-oldest rocks are in the bottom layer.
-younger rocks are in the top layer.
Relative Age- how old something is, in comparison with something else
-the age of undisturbed rocks can be determined by examining layer sequences
-the age of disturbed rocks may have to be determined by fossils or other clues.
Unconformaties- gaps in rock layers
-Angular Conformity- rock layers are tilted and younger sediment layers are deposited horizontally on top the eroded and tilted layer
-Disconformities- a layer of horizontal rock once exposed and eroded
-Non Conformity- layers of sediment form over igneous or metamorphic rock
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