6.2 Relative Dating: Which Came First? Pgs. 137-141.

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Relative Dating: Which Came First?

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6.2 Relative Dating: Which Came First? Pgs

 Relative Dating: Determining whether an object or event is older or younger than other objects or events.

 A principle that states that younger rocks lie above older rocks in undisturbed sequences.

 We assume that the sediments were deposited horizontally.  Any changes to that must have happened afterwards.

 Sometimes the rocks are disturbed.

 The fault or intrusion must’ve come after the sediment was deposited.

 The ideal sequence of rock layers that contains all the known fossils and rock formations on Earth arranged from oldest to youngest.  We use it to compare when we are not sure of the age of a rock sequence.

 Unconformities-when the surface is missing part of the geologic column.

 OUT: What do you think happened to the series of rocks now?