Dating.

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Presentation transcript:

Dating

Absolute Dating – The actual age of an object. Found by determining the amount of radioactive material in the object.

Relative Dating The age of an object compared to another object or event.

Relative Dating Layers of rock show the relative age of each layer.

The Law of Superposition  In undisturbed layers of rock, the lowest layer is the oldest and the age of the rock layers gets younger as you move upward.

Dating Starts to Get Tough Often rock layers will get disturbed by an earthquake, erosion, or by molten magma seeping into it, causing the layers to realign.

Index Fossil Review… An index fossil is a fossil of an organism that lived all across the world, but only for a short period of time. Index Fossils help scientist determine the relative age of rock layers located in different places.

The fossils closest to the surface are most similar to the animals alive today.

Which came first?