The image above shows two different kinds of contacts between limestone (brick p

Question

The image above shows two different kinds of contacts between limestone (brick pattern) and granite (dot pattern). What kind of contact is shown in each picture? What principle do you use to determine the relative age of the two units in each image? Think about what you know about where granite forms. Check p.143 for info on limestone. Given this information, why might you conclude that a large amount of time is missing (not preserved) in the first image? What kind of contact is shown at 'G' in Question 2 above? Does this kind of contact also likely represent a lot of missing time? Explain.

Explanation / Answer

1) a ) disconformity and b) angular unconformity

2) principles of inclusion and principles of cross cutting relation

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