-2 c). Units C and B are basalt. Each has inclusions of other rocks fed the two

Question

-2 c). Units C and B are basalt. Each has inclusions of other rocks fed the two from the section. Dikes cutting through the sequence 1. Which of the two igneous units is a sill? 2. how do you know? . igneous units. Units A, B, D and F are sedimentary 3. The other igneous unit is what typr of body? 4. Why is it not possible to differentiate between the two possibilities for the igneous bodi es in your previous answer? 5. Which unit is the youngest in the cross section? 6. What are the relative ages of the two igneous units? place where the feeder dikes intersect has not been completed. Based on your 7. The interpretation of the relative ages of these two units, complete the di agram. d). Two stratigraphic sections along with an igneous (unit A) and a metamorphic body (unit B) are shown. The strata in the stratigraphic sections are sedimentary in origin. Applying the techniques you havr learned to unravel geologic history, answer the following: 1. What type of contact separates A from the rest of the units? Baked codactsM 1D 2. What is the surface below I? 3. Which unit is oldest? 4. What type of unconformity is represented by the wavy line in F'? Discontnuitu, because he bedins are porallet to eh

Explanation / Answer

1. C is sill.

2. We know from the tabular cross-section which is charactersitic of a sill. It does not cut across any other section.

3. The other igneous unit is a Pluton.

5. The dikes are the youngest units in the cross section.

6. Amongst the two igneous sections C and E, the section C is older than E

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