Law #1: Law of Superposition. This states that, for sedimentary rocks (those the

Question

Law #1: Law of Superposition. This states that, for sedimentary rocks (those they occur in layers, like the ones above), the oldest layer is at the bottom and the youngest layer is at the top.

Question #1: Which sedimentary rock layer is the oldest?   __________________________

Law #2: Law of Original Horizontality. This law states that, for sedimentary rock layers, these layers were originally deposited horizontal, or flat.

Question#2: Are the rock layers in the Figure 1 flat?    Yes or No (hint: for reference, compare with the rocks in the lower part of Figure 7)

Question 3: What is the oldest layer? _____________________________

Question 4: What is the youngest? _________________________________

Question 5: You notice at the top that the siltstone is cut by several streams. Which is older… the siltstone or the stream?   __________________________________

Question #6: Which type of unconformity (of the three listed in Figure 5) is shown in Figure 2?   ____________________________________________________

Question #7: Which letter represents a layer of shale?   ________________

Question #8: How do you know, based on your knowledge of unconformities, that there is not one represented in Figure 6? ____________________________________________

Question #9: Which law of geology determines which orientation letter F was deposited? _________________________________________________________________

Question #10: Supposed that letter B and C had the same fossil type. What might you conclude regarding their depositional history?   ___________________________________

Question #11: Is there evidence in this picture that there was another layer deposited between layer D and layer F? Explain why or why not.   _________________________________________________________________________

Question #12: The caption describes a “zone of contact” forming as the dike intruded into the rock layers. Is this zone of contact shown in the picture? (yes or no)____________

Instructions: Now that you possess the knowledge that you require to figure out the sequence of events, write out the lettered sequence (from oldest to youngest) below the figure. For example, you can write the sequence like this:

Explanation / Answer

1-In fig-1 Limestone is the ololdest lalayer

2-yes,the rock layer in the fig-1 is flat

3-Limestone is the oldest layer

4- Siltstone is the younger layer

5-Siltstone is older than the stream because first siltstone is deposited then stream would cut the siltstone bed

6-The unconformity shown in fig-2 is a disconformity type .

7-F letter represents a layer of shale

8-First A,B,C,D was deposited and tilted due to tectonic activity and then erosion of the bed occurs and then after some time again F deposited above the bed.The time of erosion gives an idea of about unconformity.

9-Law of Horizontality represents the bed F deposited flat.

10-Regarding their depositional history,we may conclude that there was same climatic condition when the bed B,C deposited and hence the fossil of Trilobite was found in both the bed.

11-

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