Eons Eons

Oldest calcareous algae Oldest traces of invertebrate animals

Bitter Springs biota 0.83-0.80 Ga

Bangiophyte red alga 1.2 Ga -

Oldest spiny acritarchs 1.5 Ga -Oldest sphaeromorphic acritarchs 1.85-1.4 Ga

Gunflint biota 1.9 Ga

Decline of uraninite -Major deposits of banded iron formations

Cyanobacterial biomarkers and steranes (eukaryotes?) 2.7-2.6 Ga

Barberton Greenstone Belt 3.5-3.2 Ga Oldest microbial fossils 3.5-3.4 Ga-

Oldest stromatolites (Warrawoona Group) 3.5-3.4 Ga

Oldest terrestrial rocks (Great Slave Lake, Canada) ' 4.03-4 Ga b m a c re

0 0

Post a comment