The N. American Cambrian Craton: A. was Perfectly flat B. dominated by arches an

Question

The N. American Cambrian Craton:

A. was Perfectly flat

B. dominated by arches and basins

C. surrounded by active margins

D. non of these

Point Value: 2

2.This question has not been answered completely

The largest feature of the N. American Cambrian Craton is the:

A. Michigan basin

B. cincinnati Arch

C. transcontinental arch

Point Value: 2

3.This question has not been answered completely

Thick Quartzites and shales of the Unita Mountain GROUP deposited in:

A. aulacogen setting

B. Mid oceanic ridges

C. continental collision setting

Point Value: 2

4.This question has not been answered completely

The Cambrian cross bedded sandstones exposed in the Dells of the Wisconsin River were formed by:

A. meteorite impacts

B. continental rifting

C. wind-blown sand dunes

Point Value: 2

5.This question has not been answered completely

Widespread sheet-like distribution and maturity of the Cambrian sandstones implies:

A. high clay content

B. poor sorting

C. low lands and tectonic stability

Point Value: 2

6.This question has not been answered completely

Gluconite forms on the Sea floor by:

A. large waves

B. slow deposition and sluggish chemical reactions

C. storms

Point Value: 2

7.This question has not been answered completely

Paleomagnetic data indicate the location of N. America:

A. close to the Equator

B. close to the north pole

C. close to the south pole

Point Value: 2

8.This question has not been answered completely

Hummocky stratification in fine sandstone from the Cambrian Tunnel City, Wisconsin was formed by:

A. slugish chemical reaction

B. slow deposition

C. large waves

D. evaporation

Point Value: 2

9.This question has not been answered completely

During the Cambrian times, all margins of North America were:

A. Active margins

B. Passive margins

C. subduction zones

D. oceanic trenches

Point Value: 2

10.This question has not been answered completely

Quartz sands along the Alabama_Georgia coast are similar to those of the:

A. Upper Precambrian of the N. American Craton

B. Upper cambrian of the N. American Craton

C. Upper Mesozoic of the N. American Craton

Point Value: 2

11.This question has not been answered completely

By the end of Cambrian time, at least _________of the low surface of the N. American continent had been flooded by the Sauk transgression.

A. two-fourths

B. one-fourth

C. three-fourths

Point Value: 2

12.This question has not been answered completely

Lower and Middle Cambrian deposits from Jasper National park in the Canadian Rockies were depsited on the:

A. back arc setting

B. trench setting

C. subsiding continental margin

Point Value: 2

13.This question has not been answered completely

The Cambrian Sauk transgression:

A. was continous

B. was interrupted by partial retreat

C. did nott flood N. America

Point Value: 2

14.This question has not been answered completely

During Cambrian, Ediacaran animals disappeared completely and were replaced by:

A. birds

B. Dinosaurs

C. small shelly fossils

Point Value: 2

15.This question has not been answered completely

the oldest known fossils consist of filaments of :

A. Mullscs

B. Cyanobacteria

C. brachiopods

Point Value: 2

16.This question has not been answered completely

Which of the following was the dominant Cambrian sediment:

A. Quartz-rich shale

B. Quartz-rich clay

C. Quartz-rich sand

Point Value: 2

17.This question has not been answered completely

Stromatolite structures can form only in:

A. deep marine setting

B. sand dunes

C. water shallow enough for photosynthsis

Point Value: 2

18.This question has not been answered completely

Stromatolites have been scarce since the:

A. Precambrian

B. Mesozoic

C. Ordovician

Point Value: 2

19.This question has not been answered completely

Which of the following were the first major group of organisms to leave an extensive record of very rapid diversification?

A. brachiopodes

B. trilobites

C. stromatolites

Point Value: 2

20.This question has not been answered completely

The oldest clear evidence of life were the :

A. microfossils snails

B. microfossils of cyanobacterial fillaments

C. microscopicc trilobites

Explanation / Answer

1) B

2) C

3) A

4) C

5) C

6) B

7) A

8) C

9) B

10) B

11) 3/4

12) B

13) A

14) C

15) B

16) C

17) C

18) C

19) B

20) B

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