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Relative Dating of Rocks Layers. Age of Earth Early 1900s: 6000 years old Today: 4.6 billion years old How did scientist come up with this number? 1)Relative.

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Presentation on theme: "Relative Dating of Rocks Layers. Age of Earth Early 1900s: 6000 years old Today: 4.6 billion years old How did scientist come up with this number? 1)Relative."— Presentation transcript:

1 Relative Dating of Rocks Layers

2 Age of Earth Early 1900s: 6000 years old Today: 4.6 billion years old How did scientist come up with this number? 1)Relative Age Dating 2)Absolute Age Dating

3 James Hutton (1700s) –Developed the principle of uniformitarianism processes occurring today have been occurring since Earth formed.

4 1) Relative Age Dating -Comparing one rock layer to another. -Sequences the order of events -No exact dates -Easy comparison of fossil ages

5 Geologic Principles a)Original Horizontality – sedimentary rocks are deposited in horizontal layers.

6 b)Superposition – in an undisturbed rock sequence: -Oldest rock layers are at the bottom -Youngest layers are on top

7 Law of Superposition Which layer is the oldest? Which layer is the youngest? Would the fossils in rock layer U be older or younger the fossils in rock layer X? How do you know? X L U M S


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