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en.wikipedia.org/wiki/Stromatolite

Stromatolites are a major constituent of the fossil record of the first forms of life on earth. They peaked about 1.25 billion years ago and subsequently declined in abundance and diversity, so that by the start of the Cambrian they had fallen to 20% of their peak. The most widely supported explanation is that stromatolite builders fell victim to grazing creatures (the Cambrian substrate ...

sciencestruck.com/what-are-stromatolites-how-do-they-form

In fact, sedimentary structures that are around 3.5 billion years old are believed to be the oldest evidence of life on Earth. Nora Noffke, a geobiologist at Old Dominion University, has recently found patterns on 3.5 billion-year-old stromatolites in the Pilbara region of Western Australia.

www.answers.com/Q/How_old_are_stromatolites

Identical stromatolites are being formed not 15 miles from there 3.5 billion year old fossilised ancestors.Icthyosaurs on the other had appeared in the fossil record about 245 million years ago in ...

www.fossilmuseum.net/Tree_of_Life/Stromatolites.htm

Stromatolites are not only Earth's oldest of fossils, but are intriguing in that they are our singular visual portal (except for phylogenetic determination of conserved nucleic acid sequences and some subtle molecular fossils) into deep time on earth, the emergence of life, and the evolving of the beautiful forms of life of modern time.

www.britannica.com/science/stromatolite

Stromatolites were common in Precambrian time (i.e., more than 542 million years ago). Some of the first forms of life on Earth are recorded in stromatolites present in rocks 3.5 billion years old. Although stromatolites continue to form in certain areas of the world today, they grow in greatest abundance in Shark Bay in western Australia. A ...

www.theguardian.com/science/2016/aug/31/oldest-fossils-on-earth-discovered-in...

“Up until now the oldest stromatolites have been from Western Australia and they are roughly 3,500 million (3.5bn) years [old],” said Clark Friend, an independent researcher and co-author of ...

www.lakesuperior.com/the-lake/natural-world/192feature

Stromatolites are thought to have been common from 3.5 billion years ago until multicelled animal predators became common about 600 million years ago. Fossilized stromatolites, first found in the Gunflint formation, have subsequently been found in numerous places around the world, including Steep Rock Lake near Atikokan in northwestern Ontario.

seapics.com/feature-subject/marine-invertebrates/stromatolite-pictures.html

Photo of living stromatolite, limestone accretion formed by cyanobacteria, may be up to 1, 000 years old, fossil stromatoilites are the oldest known life forms on earth, up to 3.5 billion years old, Shark Bay, Western Australia. Picture #: 071516. Picture of living stromatolites that may be up to 1, 000 years old.

jrscience.wcp.muohio.edu/fieldcourses01/papersmarineecologyarticles/stromatolites-the...

Stromatolites are one of the longest living forms of life on this planet. They can be traced back 3.5 billion years to the early Archean eon (Awaramik and Sprinkle, 1999). Stromatolites are sedimentary structures produced by the sediment trapping, binding, and precipitating activity of phototrophic microbes.

www.ucmp.berkeley.edu/bacteria/cyanofr.html

The cyanobacteria have an extensive fossil record. The oldest known fossils, in fact, are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old. This may be somewhat surprising, since the oldest rocks are only a little older: 3.8 billion years old! Cyanobacteria are among the easiest microfossils to recognize.