DETERMINING RELATIVE ROCK AGES Part 1: Using the Principles of Relative Dating F

Question

DETERMINING RELATIVE ROCK AGES Part 1: Using the Principles of Relative Dating For each cross-section diogram, you will number the units and events in order of formation. The oldest unit is number 1. Continue until the youngest unit is numbered. 1. Number the four events form oldest to youngest. Remember, 1 is the oldest. Sandstone Shale Limestone a. Which is older, Unit A or Unit F b. Which is older, Unit C or the erosion surface (unconformity, shown by the wavy liner c. Number the seven events, including the unconformity, from oldest to youngest. 3. a. What is the diagonal straight line through the cross section? b. Which unit is a pluton (intrusive igneous rocka c. Which is older, Unit R or the foult that cuts Unit R? d. Number the six events, incdluding the foult, from oldest to youngest. o W. H. Freeman and Company Lecture Tutorials for Introductory Geoscience 165

Explanation / Answer

1)- From the given figure:- 4- conglomerate (youngest)

3- shale

2- limestone

1- sandstone (oldest)

2)- a- unit F is older than unit A due to superposition and A being the upper most layer.

b- the erosion surface is younger than the unit C.Uplift, folding, erosion,subidenceis always younger in sequence from oldest to youngest.

c- From the given diagram , the sequence from oldest to youngest is 1-F(oldest),

2- E,

3-D,

4- C,

5- Erosion surface,

6-B.

7-A(youngest).

3)- From the given above diagram:-

a- It is fault or a dike cross cutting through the layers of rocks.

b- Unit R is the pluton which the intrusive igneous rock

c- Unit R is older than the fault cutting though it.

d- 1- Q (oldest)

2- P

3- O

4- N

5- R (intrusive igneous rock)

6- Fault (youngest)

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