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r/a dating + fossils

QuestionAnswer
principle of superposition as sediments begin to form layers, the oldest material goes to the bottom and the youngest go to the top
law of cross cutting relations any changes to the rock layers must be YOUNGER than the layer it cuts through
fossil correlation layers of rock being compared using fossils, if rocks have the same fossils, they were formed around the same time in the same place
fossil the remains of a once existing organism
uniformitarianism all natural laws and processes are the same in the universe
index fossils fossils used to estimate absolute age of a rock layer
unconformity any change or "missing piece" in a rock layer
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