portance of ordering a sequence of events in theine E. Deposition of units 7 and

Question

portance of ordering a sequence of events in theine E. Deposition of units 7 and 8. D. Submergence and deposition of unit 6, with the development of an angular unconformity 31 C. Erosion. 2 B. Regional uplift with the resulting formation of an anticline. A. Deposition of units 1, 2, 3, 4, and perhaps others. Figure 2.5 Sequence of events axample EXERCISES 1. ORDERING GEOLOGIC EVENTS For each of the following cross sections (Fig.26, (a) to ()) correctiy identify the order of the geologic events. A series of spaces to the right of each diagram is A- Angwla -discenformit V Nah camfotnit

Explanation / Answer

Following are the series of events in each example:

a) Deposition of bed 6 (Youngest event)

Deposition of bed 5, with the development of a paraconformity.

Erosion

Intrusion of igneous body took place in the form of a dike

Deposition of beds 1,2,3 took place (Oldest event)

Similarly, for other examples:

b) Deposition of beds 11, 12

Deposition of bed 10 with the development of an angular unconformity.

Erosion

Faulting displacing all the beds resulting in a normal fault

Uplift resulting in an anticline

Deposition of beds 2,3,4,5,6,7

c) Deposition of bed 8

Intrusion of igneous body cross-cutting the previous intrusion, unconformity and bed 6

Deposition of bed 7

Deposition of bed 6 with the development of a nonconformity

Erosion

Intrusion of igneous body

Deposition of beds 1, 2, 3, 4

d) Erosion

Deposition of bed 13 with the development of paraconformity

Erosion

Deposition of bed 12 with the development of angular unconformity

Erosion

Deposition of beds 7,8,9

Deposition of bed 6 with the development of disconformity

Erosion

Folding of beds 1, 2, 3, 4

Deposition of bed 1, 2, 3, 4

e) Deposition of bed 19

Deposition of bed 18 with the development of angular unconformity

Erosion

Intrusion of igneous body forcing the bed 12, 13 to bend upwards promoting the formation of a laccolith

Deposition of bed 11, 12, 13

Deposition of bed 10 with the development of angular unconformity

Erosion

Folding and tilting of sequence containing beds 1,2,3,4, 6, 8

Deposition of bed 8

Deposition of bed 6 with the development of paraconformity

Erosion

Deposition of 1, 2, 3, 4

f) Deposition of limestone bed

Deposition of sandstone bed with the development of angular unconformity

Erosion

Faulting in beds 1 to 7 creating a normal fault

Intrusion of igneous body resulting in a dike cross-cutting beds 1 to 7

Folding and tilting of beds 1 to 7

Deposition of bed 5, 6, 7

Deposition of bed 5 with the development of paraconformity

Erosion

Deposition of beds 1,2,3

g) Normal faulting on the east side of the sequence displacing the entire sequence

Intrusion of magma in the form of dike cross-cutting sandstone and limestone and lava emplacement on the surface

Reverse Faulting on the west side of the sequence

Folding of the entire sequence creating anticline

Deposition of limestone bed

Deposition of sandstone bed over an igneous body (batholith)

h) Intrusion of igneous body in the form of dike cross-cutting the entire sequence and lava emplacement on the surface

Deposition of limestone bed

Deposition of sandstone bed with the development of angular unconformity

Erosion

Intrusion of an igneous body in the form of dike cross-cutting the entire sequence

Folding and tilting of the entire sequence

Deposition of shale, limestone and sandstone beds

Deposition of sandstone bed with the development of angular conformity

Erosion

Folding and tilting of beds with the development of syncline

Deposition of sandstone, shale and limestone beds

i) Intrusion of igneous body in the form of lava emplacement on the surface

Faulting in the entire sequence

Deposition of bed 11

Deposition of bed 10 with the development of disconformity

Erosion

Deposition of beds 5,6,7,8

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