See the vertical cross section below. Indicate the relative ages of various rock

Question

See the vertical cross section below. Indicate the relative ages of various rock bodies by placing the letters on the blanks at the right of the figure, from oldest to youngest. Note Rocks B and C are igneous intrusions with the dark XXXX pattern outside the intrusive rock indicating contact effects caused by contact metamorphism. letters F and Z. represent faults. This cross section is a difficult one. Be sure to pay attention to the faults. I. Name the principle used to determine the relative age between Rock L and Rock T II. Name the principle used to determine the relative age between Rock B and Rock N III. Use the principle of original horizontally to determine the minimum number of limes the rocks in this area have been tilted? Circle One: 0 1 2 3 4 5

Explanation / Answer

Question 1:

ANS - Principle of Superposition (It states that in an undisturbed succession of sedimentary rock, the oldest layers are on the bottom. This follows due to the fact that sedimentary rock is produced from the gradual accumulation of sediment on the surface. Therefore newer sediment is continually deposited on top of previously deposited or older sediment.)

Question 2:

ANS - Principle of Inclusions (It relatively dates objects based on their placement within other earth materials. Once a rock is lithified no other material can be incorporated within its internal structure.)

Question 3:

ANS - The Principle of Original Horizontality states that due to the influence of gravity all sediment is originally deposited horizontally. In other words, as sediment fills a depositional basins we would expect the upper most surface of the sediment to be parallel to the horizon. Subsequent layers would follow the same pattern. Using this principle we can than assume that sedimentary layers which have been deformed/folded must have been deformed after all affected layers have been deposited.

The number of times the rocks in this area have been tilted are – 4.

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