Precambrian Era
By Erich Hartman
When It Occurred
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The Precambrian Era occurred from 4.6 billion
years ago to 544 million years ago.
It was the first of four eras on the geological
time scale.
The Precambrian
Supereon
• The Precambrian Supereon Is
divided into three Precambrian
eons, the Proterozoic, the
Archaean, and Hadean.
Proterozoic Eon
 This eon refers to the time from the lower
Cambrian boundary, 542 Ma (million),
back through 2500 Ma.
 The Proterozoic Eon is divided into three
eras, the Neoproterozoic,
Mesoproteozoic, and Paleoproterozoic.
Neoproterozoic Era
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This era is the upper geological era
of the Proterozoic eon, from the
Cambrian period lower boundary
(542 Ma) back to 1000 Ma.
The Neoproterozoic era corresponds
to Precambrian Z rocks of older
North American geology.
Edicaranian Period
 The
Edicaranian period is the upper
geological period of the Neoproterozoic
era.
 During this period the Edicaranian fauna
appeared.
 It happened from 630 Ma to 542 Ma.
Cryogenian Period
The Cryogenian period is the middle
period in the Neoproterozoic era.
It dated from 950 Ma to 630 Ma.
Tonian Period
The Tonian period is the earliest period in
the Neoproterozoic era.
 It dated from 1000 Ma to 950 Ma.
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Mesoproterozoic Era
 The Mesoproterozoic Era is the middle era
of the Proterozoic Eon.
 It dated from 1000 Ma to 1600 Ma.
 It corresponds to “Precambrian Y” rocks of
older North American geology.
Paleoproterozoic Period
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The Paleoproterozoic period is the oldest period
in the Neoproterozoic era.
It dates from 1600 Ma to 2500 Ma.
It corresponds to “Precambrian X” rocks of
older North American geology.
Archaean Eon
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Dated from 2500 Ma to 3800 Ma.
Hadean Eon
This term was intended originally to cover
the time before any preserved rocks were
observed.
 Some zircon crystal from 4400 Ma
demonstrated the existence of crust in the
Hadean eon.
 Other records from Hadean time come
from the moon and meteorites.
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My One Source
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www.wikipedia.com