Significance
Moderate/Medium

Shallow marine and lacustrine stromatolites in carbonates
organic-walled microfossils (eg cyanobacteria) in siliciclastics / cherts / carbonates
Controversial records of 2.2 Ga “trace fossils”

Additional Comments

Classic Early Proterozoic stromatolitic successions (Ghaap & Postmasburg Groups of Griqualand West Basin)

Early continental shelf environments (margins of Kaapvaal Craton)