Onverwacht Group

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Onverwacht Group
Stratigraphic range: Paleoarchean
>3300 Ma
TypeGeological group
UnderliesFig Tree Formation
Thickness16,370 m (53,710 ft)
PrimaryGreenstone belt
OtherVolcanic rock
Coordinates25°48′S 31°00′E / 25.8°S 31.0°E / -25.8; 31.0Coordinates: 25°48′S 31°00′E / 25.8°S 31.0°E / -25.8; 31.0
RegionBarberton Greenstone Belt, Mpumalanga
Country South Africa
ExtentKaapvaal Craton
South African Greenstone Belt.png
Location of the Barberton Greenstone Belt

The Onverwacht Group or Onverwacht Series is a series of greenstone belts and volcanic rock formations from the Archean Eon in the Kaapvaal Craton in South Africa and Eswatini.

A well known part of the Onverwacht Series is visible in the Komati valley, located in the east of the Transvaal region.


The Onverwacht Group can be divided into two subgroups with six formations:

The fossils found in the Onverwacht Series are among the oldest found on Earth.[1]

See also[edit]


  1. ^ Engel et al., 1968


  • Engel, A.E.; B. Nagy; L.A. Nagy; C.G. Engel; G.O. Kremp, and C.M. Drew. 1968. Alga-Like Forms in Onverwacht Series, South Africa: Oldest Recognized Lifelike Forms on Earth. Science 161. 1005–1008. Accessed 2008-07-12. doi:10.1126/science.161.3845.1005 PMID 17812798

External links[edit]