Use the Rock Records on page 1 to complete the questions below. 1. Examine Record A. Use the three basic rules to figure out the ages of the layers. In Chart A, list the layers from youngest to oldest with the youngest layer in the first row.

2. Look for signs of tilting, erosion, or folding. In the second column in Chart A, write whether you think tilting, erosion, or folding took place. Write tilting, erosion, or folding next to the letter of any rock layer that was formed when the tilting, erosion, or folding took place. If you see no evidence of tilting, erosion, or folding, write none.

3. Repeat steps 1 and 2 for Record B. Record the data in Chart B.


Data

Chart A
Rock Layers (youngest to oldest) Tilting, Erosion, or Folding
1 -
2 -
3
4
5
6
7
8
9
10
11
12

Chart B
Rock Layers (youngest to oldest) Tilting, Erosion, or Folding
1 -
2 -
3
4
5
6
7
8
9
10
11
12
13

Observations
1. Where does the unconformity occur in Record A and Record B?

Analysis

2. Study Record A. What can you say about the age of layer K from your data and observations?

3. Study Record B. What can you say about the age of layer c from your data and observations?

4. What do you think took place in layers C and E, which are exposed at the top surface of the layers in Record A?

Conclusions
5. Write about how the group of rock layers in Record A formed. Include tilting, erosion, and folding.

6. Write about how the group of rock layers in Record B formed. Include tilting, erosion, and folding.