Figure 2.4 Disconformity exampies ORDERING A SEQUENCE OF GEOLOGIC EVENTS In this

Question

Figure 2.4 Disconformity exampies ORDERING A SEQUENCE OF GEOLOGIC EVENTS In this section, a method is illustrated for organizing a sequence of geologic events into logical order. To the right of the geologic cross section in Figure 2.5, the sequence of events has been listed in the geologically correct order of occurrence. The oldest geologic event has been placed at the base, and the youngest geologic event at the top. Where an unconformity fold, or fault occurs, the specific variety is stated. The exercises that follow involve the appli cation of the basic geologic principles and laws previously explained and demonstrate the importance of ordering a sequence of events in the interpretation of geologic history. E. Deposition of units 7 and 8. D. Submergence and deposition of unit 6, with the development of an angular unconformity. 3C. Erosion 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 example

Explanation / Answer

a)-

- Deposition of beds 5,6 (newer)

- Formation of disconformity

- erosion of layer 3

- plutonic upliftment

- Beds 1,2,3 are deposited (oldest)

b)-

- Deposition of 10,11,12

- Angular unconformity is formed

- erosion of the top of anticline

- development of fault

- Anticline formation

- 2,3,4,5 deposition

c)

- Intrusion upliftment in form of dike

- 6,7,8 deposited

- Disconformity formed in bed 4

- Erosion started at 4 bed

- Magma intruded and formed the stock

- 1,2,3,4 deposited

d)

- erosion of top surface(latest)

- deposition of 12,13

- erosion (angular unconformity)

- folding (anticline and syncline) formation

- 6,7,8,9 deposition

- ersion and disconformity

- 1,2,3,4 deposition( oldest)

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