Eons Quiz Study Guide

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10 Terms

1
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What are the three divisions of the Precambrian Eon based on radiometric dates?
Hadean, Archean, and Proterozoic Eons.
2
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What was the time frame of the Protozoic Eon?
542 million years to 2.5 billion years.
3
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What significant geological event characterized the Hadean Eon?
The formation of Earth.
4
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What mineral formation is associated with extreme temperatures during Early Earth?
Komatiite.
5
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How did the Archean atmosphere initially form?
Through outgassing with no free oxygen present at first.
6
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What evidence indicates the presence of oxygen in early geological history?
Banded Iron Formations (BIFs).
7
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What was the first supercontinent formed in the Proterozoic Eon?
Gondawanaland.
8
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What is the significance of Banded Iron Formations (BIFs)?
They reflect increasing oxygen levels in the atmosphere.
9
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When did the first multicellular organisms appear?
During the Ediacaran period, approximately 670 - 570 million years ago.
10
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What type of geological evidence supports the occurrence of early ice ages in the Proterozoic?
Glacial Tillite.