Onverwacht Group

Onverwacht Group Stratigraphic range: Paleoarchean > 3300 Ma Pha. Proterozoic Archean Had'n ↓
Type	Geological group
Sub-units	Subunits
Underlies	Fig Tree Formation
Thickness	16,370 m (53,710 ft)
Lithology
Primary	Greenstone belt
Other	Volcanic rock
Location
Coordinates	25°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
Region	Barberton Greenstone Belt, Mpumalanga
Country	South Africa  Eswatini
Extent	Kaapvaal Craton
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.

Subdivision[]

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

• • - 920 metres (3,020 ft)
  • - 1,920 metres (6,300 ft)
  • - 4,850 metres (15,910 ft)
• • Komatii Formation - 3,500 metres (11,500 ft)
  • - 1,980 metres (6,500 ft)
  • - 3,200 metres (10,500 ft)

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

See also[]

• Archean life in the Barberton Greenstone Belt
• Warrawoona Group

References[]

Bibliography[]

• 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[]

• (in German)Der Barberton Greenstone Belt und Komatiite

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