12. Refer to Figure 1. Place the sequence of events in order from oldest to youn

Question

12. Refer to Figure 1. Place the sequence of events in order from oldest to youngest. Remember to pay attention to the geologic time periods!

a. Faulting/tilting of Ordovician-Devonian sedimentary unit

b. Erosion

c. Emplacement of the granite

d. Emplacement of dike Y

e. Deposition of Cretaceous sedimentary rocks

f. Erosion

g. Emplacement of dike X

h. Deposition of Ordovician through Devonian sedimentary rocks

(1) c, f, h, a, d, b, e, g

(2) c, f, g, d, a, b, e, g

(3) c, f, h, d, a, b, e, g

(4) h, c, f, d, a, b, e, g

(5) h, c, f, a, d, b, e, g

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

The third option is the right answer "C, F, H, D, A, B, E, G".

At first there was an emplacement of granite rock during Precambrian period, which was followed by erosion, later formed were sandstone and shale during Ordovician time, following Silurian limestone and Devonian shale and sandstone later. Again erosion process took place which got again filled up by sediments of Cretaceous conglomerate, shale and sandstone.

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