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Geology 102 {2nd} Ch. 9
Proterozoic Eon
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Geology
04/28/2010

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Term
Proterozoic Eon last from --- billion year to --- million years ago
Definition
2.5 ; 542
Term
Comprises --- of Earth history

A. 22%
B. 32%
C. 42%
Definition
C. 42%
Term
Proterozoic Eon was divided into all of these three eras except:

A. Paleoproterozoic Era
B. Mesoproterozoic Era
C. Cenoproterozoic Era
D. Neoproterozoic Era
Definition

C. Cenoproterozoic Era

 

Paleoproterozoic Era (2.5 - 1.6 by ago)

Mesoproterozoic Era (1.6 to 1.0 by ago)

Neoproterozoic Era (1.0 by ago to the beginning of the Paleozoic, 542 my ago)

 

Term
The Beginning of the Proterozoic Marks the Beginning of:

Definition

•More modern style of plate tectonics
•More modern style of sedimentation
•More modern global climate with glaciations
•Establishment of the beginnings of an oxygen-rich atmosphere
•Emergence of eukaryotes

Term
Precambrian provinces were welded (or sutured) together to form a large continent called --- during the early Proterozoic.
Definition
Laurentia
Term
Provinces were assembled by about --- b.y. ago.

A. 1.7
B. 2.7
C. 3.7
Definition
A. 1.7
Term
Laurentia continued to grow by --- throughout the Proterozoic.

A. Incretion
B. Accretion
C. Decresion
Definition
B. Accretion
Term
Late in the Proterozoic, the continents became assembled into a supercontinent called ---.
Definition
Rodinia
Term
Sedimentation on and around the craton consisted of shallow water clastic and carbonate sediments deposited on broad --- and in ---.
Definition

continental shelves

 

epicontinental seas

Term
Proterozoic glaciations occurred during all except:

A. Paleoproterozoic
B. Mesoproterozoic
C. Neoproterozoic
Definition
B. Mesoproterozoic
Term
Major Events of the Paleoproterozoic included all but:

a. Active plate tectonics
b. Major mountain building on all major continents
c. Earth's first glaciation
d. Major increase in fossilization
e. Widespread volcanism (continental flood basalts)
f. Rise in atmospheric oxygen (great oxidation event)
g. Accumulation of high concentrations of organic matter in sediments (Shunga event) 2000 m.y. ago, and generation of petroleum
h. Oldest known phosphorites and phosphate concretions
Definition
d. Major increase in fossilization
Term
--- developed around margins of the Archean provinces.
Definition
Orogenic belts
Term
The Paleoproterozoic Era ranges from about --- b.y. to --- b.y.
Definition
2.5-1.6
Term
This sequence of events in the Wopmay orogenic belt is called a ---, and is a result of ---.
Definition

Wilson Cycle

 

plate tectonics

Term
1. Rifting and opening of an ocean basin
2. Sedimentation along new continental margins
3. Closure of the ocean basin

Are all part of what?
Definition
Wilson Cycle
Term
Definition