Stromatolites, the Oldest Fossils



Girvanella Form Genus Stromatolites	Collenia Form Genus Stromatolites	Stromatolites with Rhodochrosite Precipitant	Stromatolites with Rhodochrosite Precipitant
Lower Proterozoic (2.2 - 2.4 billion years old) Chocolay Group, Chocolay Hills, Michigan	Lower Proterozoic (2.2 - 2.4 billion years old) Chocolay Group, Chocolay Hills, Norern Michigan	Lower Proterozoic (2.2 - 2.4 billion years old) Chocolay Group, Chocolay Hills, Norern Michigan	Lower Proterozoic (2.2 - 2.4 billion years old) Chocolay Group, Chocolay Hills, Norern Michigan

Gunflint Stromatolites
Paleoproterozoic (1.9 billion years old) Gunflint Formation, Ontario, Canada