Siderian

Source: Wikipedia, the free encyclopedia.
Siderian
2500 – 2300 Ma
A reconstruction of the Earth's continents during the middle Siderian, circa 2.4 Ga.
A Siderian banded iron formation in Dales Gorge, Western Australia
Artist's impression of the Earth during the Huronian glaciation, starting from mid-Siderian
Chronology
Proposed redefinition(s)2630–2420 Ma
Gradstein et al.
Proposed containerNeoarchean
Gradstein et al.
Etymology
Name formalityFormal
Usage information
Celestial body
Period
Stratigraphic unitSystem
Time span formalityFormal
Lower boundary definitionDefined Chronometrically
Lower GSSA ratified1991[1]
Upper boundary definitionDefined Chronometrically
Upper GSSA ratified1991[1]

The Siderian Period (

Ma to 2300 Ma. Instead of being based on stratigraphy, these dates are defined chronometrically
.

The deposition of

oxygen catastrophe, which, some geologists believe triggered the Huronian glaciation.[2][3]

Since the time period from 2420 Ma to 2250 Ma is well-defined by the lower edge of iron-deposition layers, an alternative period named the Oxygenian, based on stratigraphy instead of chronometry, was suggested in 2012 in a geological timescale review.[4]

References

  1. ^
    doi:10.18814/epiiugs/1991/v14i2/005
    .
  2. PMID 16754607
    .
  3. PMID 16061801
    .
  4. ISBN 978-0-44-459390-0
    .
Stub icon

This geochronology article is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Siderian&oldid=1184782122"