1.This question has not been answered completely Worldwide transgressions and re

Question

1.This question has not been answered completely

Worldwide transgressions and regressions are caused by:

A. expanson and melting of large glaciers

B. convection currents in the mantle

C. outer core motion

Point Value: 2

2.This question has not been answered completely

Sedimentary facies describes:

A. change in isotopes

B. change in mineral hardness

C. variations related to depositional environments

Point Value: 2

3.This question has not been answered completely

Channeled Scabland formed by:

A. glacier floods

B. volcanic activity

C. meteorite impacts

Point Value: 2

4.This question has not been answered completely

The famous chalk deposits of the White cliffs of Dover, formed from:

A. the skeletons of microspcopic algae

B. accumulation of evaporite deposits

C. erroded volcanic material

Point Value: 2

5.This question has not been answered completely

The term Rock Series refers to:

A. all rocks coressponding to a given geologic Period

B. all rocks coressponding to a given geologic Eon

C. all rocks coressponding to a given geologic Epoch

Point Value: 2

6.This question has not been answered completely

The most basic local unit of stratigraphy is the:

A. layer

B. grain

C. formation

Point Value: 2

7.This question has not been answered completely

The most conspicuous single property of sedimentary rocks is:

A. stratification

B. cross cutting layes

C. superposition

Point Value: 2

8.This question has not been answered completely

Huge ripple marks up to 7 meters in height form by:

A. sedimentation from oceans

B. erosion by wind

C. glacial movements

Point Value: 2

9.This question has not been answered completely

Index fossil is useful for:

A. mapping cross cutting relationships

B. correlation between sedimentary strata

C. reccognizing unconformity surfaces

Point Value: 2

10.This question has not been answered completely

According to the cross-cutting relationships:

A. Caldonian granites must be older than the metamorphic rocks they intruded

B. Caldonian granites must be younger than the metamorphic rocks they intruded

C. Caldonian granites must be the same age as the metamorphic rocks they intruded

Point Value: 2

11.This question has not been answered completely

the term rock System referes to:

A. all rocks corresponding to a given Era

B. all rocks corresponding to a given period

C. all rocks corresponding to a given Eon

Point Value: 2

12.This question has not been answered completely

Which of the following is not a fossil:

A. moss agates

B. dendrites

C. concretions

D. all of these

Point Value: 2

13.This question has not been answered completely

Angular unconformity shows:

A. No discordance between strata below and above

B. angle of discordance between older and younger strata

C. discordance between igneous or metamorphic rock and overlying sedimentary rocks

D. All of these

Point Value: 2

14.This question has not been answered completely

Major geologic time scale divisions are called

A. periods

B. Eras

C. Epochs

D. Ages

Point Value: 2

15.This question has not been answered completely

The thinnest rock layer observable in a formation is

A. A system

B. A group

C. A Stratum

D. An Eon

Point Value: 2

16.This question has not been answered completely

In stratigraphy: transgressive facies pattern reflects:

A. Enlargement of land area

B. Shrinkage of land area

C. Seaward shift of facies through time

D. None of these

Point Value: 2

17.This question has not been answered completely

According to principal of fossil correlation and index fossils

A. Like assemblages of Fossils are of diiferent age

B. Like assemblages of Fossils are of like age

C. Index fossils are not used for correlation

Point Value: 2

18.This question has not been answered completely

Glacial till formed from:

A. sorted sediments

B. unsorted sediments

C. sediments that have the same grain size

Point Value: 2

19.This question has not been answered completely

The relative timing of geologic events is done by:

A. using the radioactive elements

B. applying the principles of stratigraphy

C. both A & B

Point Value: 2

20.This question has not been answered completely

Marine regression results from:

A. Melting of polar ice caps

B. Displacement of ocean water by undersea volcanism

C. Localized sinking or subsidence of the land in coastal areas

D. none of these

Explanation / Answer

1. A. expanson and melting of large glaciers

2. C. variations related to depositional environments

3. A. glacier floods

4. A. the skeletons of microspcopic algae

5. C. all rocks coressponding to a given geologic Epoch

6. C. formation

7. A. stratification

8. B. erosion by wind

9. B. correlation between sedimentary strata

10. B. Caldonian granites must be younger than the metamorphic rocks they intruded

11. B. all rocks corresponding to a given period

12. B. dendrites

13. B. angle of discordance between older and younger strata

14. B. Eras

15. C. A Stratum

16. B. Shrinkage of land area

17. B. Like assemblages of Fossils are of like age

18. B. unsorted sediments

19. C. both A & B

20. D. none of these

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