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Earth Evolution
Earth Materials
Earth Evolution
Geological History
Solar System
Archean Proterozoic Early
Late Paleozoic Mesozoic Cenozoic

Archean Beginnings 3800-2500 Ma
Direct Fossil Evidence

Direct fossil evidence for the existence of early photosynthetic bacteria was found in sedimentary rocks formed just 300 million years later, the Apex Cherts in Australia. They reveal individual cells held together to form long filaments that look like beads on a string, resembling modern cyanobacteria.

Modern Cyanobacteria

3500 million year old Apex Chert, Australia
containing the first fossil evidence of life on Earth

Indirect Fossil Evidence