Archean (4000 Ma)

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Representation and status

Index
-
CMYK Color
0/100/0/0 (Commission for the Geological Map of the World)
RGB color
R: 240 G: 4 B: 127
Rank
chronostratigraphic Eon
Validity
Unit is in Use
Status
valid formal name
SCS note
-
SCS date
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Comment
The oldest known rocks on Earth are dated at approx. 3800 Ma (epimetamorphosed dykes in the region of Issua). Before that time the material was permanently recycled and submitted to a strong meteoritic bombardment.

Nomenclature

German
Archaikum
French
Archéen
Italian
Archeano
English
Archean (4000 Ma)
Origin of the Name
archeo (Latin): old (see also Grand Canyon, Colorado).
Historical Variants
Archean (Dana 1876), Archaikum = Urzeit (Roesli 1948), Archaean, Archæan, Archeozoic
Nomenclatorial Remarks
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Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description
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Geomorphology
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Thickness
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Components

Lithological content
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Mineral content
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Fossil content
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Hierarchy and succession

Units at roof
    -
Units at floor
Lateral equivalents
Upper boundary
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Lower boundary
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Stratigraphic discussion
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Age

Age at top
Archean
Note about top
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Age at base
Archean
Note about base
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Dating method
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Geography

Geographical extent
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Type area
Type locality
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Type profile
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Reference profiles
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Point of interest
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Paleogeography and tectonic

Paleogeography
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Kind of protolith
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Conditions of formation
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Sequence
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Tectonic Unit (resp. main category)
Time Scale
  • Paratethys
  • Mammal stages
Metamorphism
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Metamorphic facies
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Note on metamorphism
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References

Definition
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Revision
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Important publications
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Material and varia

Applications
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  • Neoarchean (2800 Ma) Show details

    Origin of the Name
    -
    Rank
    chronostratigraphy
    Status
    informal term
    Valid name
    In Short
    -
    Age
    Archean - Archean
    Thickness
    -
    Geographical extent
    -
    Type area
    -
    Comment
    -
  • Mesoarchean (3200 Ma) Show details

    Origin of the Name
    -
    Rank
    chronostratigraphy
    Status
    informal term
    Valid name
    In Short
    -
    Age
    Archean - Archean
    Thickness
    -
    Geographical extent
    -
    Type area
    -
    Comment
    -
  • Paleoarchean (3600 Ma) Show details

    Origin of the Name
    -
    Rank
    chronostratigraphy
    Status
    informal term
    Valid name
    In Short
    -
    Age
    Archean - Archean
    Thickness
    -
    Geographical extent
    -
    Type area
    -
    Comment
    -
  • Eoarchean (4000 Ma) Show details

    Origin of the Name
    -
    Rank
    chronostratigraphy
    Status
    informal term
    Valid name
    In Short
    -
    Age
    Archean - Archean
    Thickness
    -
    Geographical extent
    -
    Type area
    -
    Comment
    -