update EXERCISES Relative Dating Exercises Examine the geologic cross sections a

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EXERCISES Relative Dating Exercises Examine the geologic cross sections and determine the relative ages of the rock bodies, lettered features such as intrusions, faults or surfaces of erosion, and other events such as tilting and folding. Always start with the oldest rock and work toward the present. List the letters in order, with the oldest at the bottom. Example 1.1 Erosion A Think about each relative dating diagram as the side view of a layer cake. In general, the oldest units are on the bottom and the youngest units are on the top. There can be lots of complexities, such as folding, faulting, erosion, and intrusion by magma. You have to put these events into the order in which they occurred, starting with the oldest, and working toward the youngest. Figure out what cuts what. If a fault cuts a bed, then the bed is older than the fault. In the figure above (Example 1.1), the sedimentary units are in the sequence P. K. M, and S; then something happened. A body of magma (Intrusion R) has intruded or cut through all of the previous layers, so it comes next in the sequence. The intrusion is eroded off at the top. (The previous layers are eroded off at the top too.) Thus the event after the intrusion is Erosion A. After Erosion A, beds B, J, and F were deposited. The answer for this problem is: P, K, M, S, Intrusion R, Erosion A, B, J, F Example 1.2 Erosion Folding In the figure above (Example 1.2), there are no letters or numbers, but you could either label the diagram A, B, C, starting at the bottom or, even easier, describe the units in order You can see that units green, red, blue, green, red, blue, green, blue, green were de- posited. Then Folding Event A occurred. Then Erosion N occurred. Then units brown, orange, and yellow were deposited. And that is the solution to the second problem.

Explanation / Answer

Question 3

For block 3 , oldest to youngest sequence is

Z , F, G, Q, S ,R ,T, L , Intrusion Y, Erosion U, E,O

Question 4

For block 4 , oldest to youngest sequence is

C, G, Fault A, Erosion I,P,W, Intrusion N , Erosion O,

Question 5

For block 5 , oldest to youngest sequence is

A,B,G,D,EROSION O, M,INTRUSION R,FAULT S ,EROSION P, L, J

Question 6

For block 6 , oldest to youngest sequence is

N,C,K, FAULT M,J, FAULT T,

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