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February 23, 2007, Newsletter Issue #128: Relative Dating II
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Tip of the Week
In the early days of geology, scientists developed several principles which they used to determine whether a particular rock unit was older or younger than another unit.
For example, the Principle of Original Horizontality stated that sedimentary rock layers (and lava flows) are deposited as relatively horizontal sheets. If they arenīt horizontal now, clearly they were somehow tipped or moved.
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