Which fossil site has some of the oldest known evidence of life on Earth?

Some of the oldest widely accepted evidence of life on Earth comes from stromatolites and microscopic fossils dating back more than 3.4 billion years. Stromatolites are layered structures built by microbial communities, especially cyanobacteria. Their ancient forms are found in places such as the Pilbara region of Western Australia and parts of South Africa. These fossils are crucial because they show that life existed very early in Earth’s history, long before plants or animals appeared. They also help scientists study how early life shaped the planet’s atmosphere and surface chemistry.