Question 7 Not yet answered Marked out of 1.00 P Flag question In the field, a g

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Question 7 Not yet answered Marked out of 1.00 P Flag question In the field, a geologist notices igneous rock below parallel sedimentary layers. The igneous rock has pieces of limestone from the first sedimentary layer contained within it. What can she say about the age of the limestone? Select one: O a. The limestone was deposited simultaneous as the emplacement of the igneous rock. O b. The limestone is older than the igneous rock. O C. The limestone is younger than the igneous rock. O d. The limestone can only be dated through its included fossils. O e. She can say nothing, this situation is impossible in the natural world.

Explanation / Answer

The limestone is older than the igneous rock.

Reason: The principle of inclusion states that if a rock fragment occurs as an inclusion within another rock, the inclusion is older than the host rock.

Probable Process of rock formation: First the limestone bed was deposited. Followed by subsidence of the area. The area was then intuded by magma which later on cooled to form igneous rocks. This intrusion led to the trapping of limestone fragment in the igneous rock. The area was then uplifted and erosion took place to give the present topography.

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