Central Witwatersrand Gr
Period:
Mesoarchean, Neoarchean
Age Interval:
Late Mesoarchean to earliest Neoarchean
Province:
Karoo Basin
Type Locality and Naming
Upward succession of Johannesburg Sub Gr (Blyvooriutzicht Fm, Main Fm, Randfontein Fm, Luipaardsvlei Fm, Krugersdorp Fm and Booysens Fm) and Turffontein Sub Gr (Kimberly Fm, Elsburg Fm, Mondeor Fm)
Synonym:
Lithology and Thickness
Lithology Pattern:
Coarse-grained sandstone
Relationships and Distribution
Lower contact
West Witwatersrand Gr (conformable)
Upper contact
Regional extent
GeoJSON
null
Fossils
Age
Base arbitrarily assigned 60% up the base of Witwatersrand (= ca. 2857 Ma), and top set as 2775 Ma
Age Span:
Beginning stage:
Mesoarchean
Fraction up in beginning stage:
0.8575
Beginning date (Ma):
2,857.00
Ending stage:
Neoarchean
Fraction up in the ending stage:
0.0825
Ending date (Ma):
2,775.25
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Rebecca Bobick (and Wen Du), modified from Walraven, F., Armstrong, R.A., and Kruger, F.J., A chronostratigraphic framework for the north-central Kaapvaal craton, the Bushveld Complex and the Vredefort structure, Tectonophysics, 171 (1990), 23-48.