Using the Principles of Relative Dating For each cross-section diagram, you will

Question

Using the Principles of Relative Dating For each cross-section diagram, you will number the units and events in order of formation. The oldest unit is number Continue until the youngest unit is numbered. Number the four events form oldest to youngest. Remember, 1 is the oldest Which is older, Unit A or Unit F? Which is older, Unit C or the erosion surface (unconformity, shown by the wavy line)? Number the seven events, including the unconformity, from oldest to youngest. What is the diagonal straight line through the cross section? Which unit is a pluton (intrusive igneous rock)? Which is older. Unit R or the fault that cuts Unit R? Number the six events, including the fault, from oldest to youngest.

Explanation / Answer

1) 1.Lime stone, 2. Shale, 3. Sandstone, 4. Conglomerate

2) a) Unit F is older, by Law of Superposition

b) Unit C is older, by Unconformity

c) F, E, D, C (by Law of Superposition), Erosion(by Unconformity), B, A (by Law of Superposition)

3) a) Cross-cutting by fault

b) R

c) Unit R is older than fault that cuts Unit R.

d) Q, P,O,N (using the Principle of Superposition), R(igneous rock intrusion) and Fault(using the Principle of Cross Cutting Relations)

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