1. 6.2 Relative Dating: Which Came First? Pgs. 137-141

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

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

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

6.  Sometimes the rocks are disturbed.

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

8.  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.

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

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