Relative and Absolute Dating

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Presentation transcript:

Relative and Absolute Dating Dating Techniques Relative and Absolute Dating

I. Relative Dating Principle of superposition-The stuff on the bottom is usually older than the stuff on top. Unconformities 1. Angular 2. Disconformity 3. Noncomformity Index Fossils-If we know the age of the sediment or the actual organism, we can

II. Absolute Dating The technique used to determine the age, in years, of an object Radioactive Decay 1. When the number of neutrons in an atom changes 2. It takes carbon about 5700 y to decay half-way 3. 5700 y = Half-Life of carbon

Radiometric Dating 1. The process by which we use the known half-life of a substance to predict how old it is ex. Potassium-Argon Uranium-Lead Uniformitarianism 1. The Earth’s processes occur pretty much the same way they did in the past.