Problem Set #1 The cross-sectional sketch below shows in simplified form various

Question

Problem Set #1 The cross-sectional sketch below shows in simplified form various age relationships among geologic units. Using the principles that you have learned from relative dating (i.e. law of superposition, cross-cutting relationships, etc.), answer the following questions. Units A and E are igneous rock. All other units are sedimentary layers. H is a fault. 1. Which is older rock unit M or rock unit D? 2. Which is older - rock unit D or rock unit A? 3. Which is older - rock unit A or rock unit N: 4. Which is occurred first- fault H or depostion of L? 5. What type of unconformity separates rock unit N and rock unit J? Principle used: Principle used: Principle used: Principle used: What type of unconformity separates rock unit F and rock unit K

Explanation / Answer

1. M is older than D. Principle used: law of superposition

2. D is older than A. Principle used: law of cross cutting

3. A is older than N. Principle used: law of superposition.

4. L is older than fault H. Principle used: law of cross cutting.

5. Erosional unconformity or disconformity seperates N and J.

Angular unconformity seperates F and K

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