8a) Which of the following is true regarding the relative ages of Dike Y and the

Question

8a) Which of the following is true regarding the relative ages of Dike Y and the fault?

(1) the fault moved after emplacement of Dike Y

(2) Dike Y was emplaced after motion on the fault

(3) there is not enough information to determine the relative ages

and

8b) Which is older, Dike X or Dike Y?

(1) Dike X

(2) Dike Y

Figure 1 shows a cross-section (a vertical cut through the Earth) of several layers that have undergone several geological events, including, faulting, intrusion by dikes, erosion, deposition of sedimentary layers, etc. (not neccessarily in this order). Names such as Ordovician, Siliurian, Devonian, etc. refer to time periods in the Geologic Time Scale (see book) Cretaceous shale & sandstone Cretaceous conglomerate Precambrian granite Precambrian granite

Explanation / Answer

8

A) answer is 1. Because fault occured after intrusion of dike y. Thats why dike also displaced.

B) dike Y. Beause dike x is cutting new formation such as Cretaceous. Where as dike y is intruded befor the deposition of Cretaceous formations.

Hit like if answer was helpful. Happy chegging :)

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