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February 2, 2007, Newsletter Issue #125: Cross-Cutting Relations
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Tip of the Week
Hereīs another of those relative dating tips that seems obvious to us in our modern sophistication, but which was pretty clever when it was originally developed:
if you have layers of rock which are cut by something - a fault, say, or basalt dike - then the rock layers are obviously older than the fault or dike which cuts them. Thatīs called the Principle of Cross-Cutting Relations.
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