Gunflintia Temporal range: Proterozoic–Cambrian^[1] Pha. Proterozoic Archean Had.
Scientific classification
Domain:	Bacteria
Phylum:	Cyanobacteria
Genus:	†Gunflintia
Species
†Gunflintia barghoornii P.K.Maithy †Gunflintia magna P.K.Maithy

Gunflintia is an extinct genus of cyanobacteria that once existed in what is now Canada and Australia. It was about five micrometres wide, and is known for being one of the first oxygen-producing cyanobacteria, which helped raise oxygen levels in the atmosphere, making Earth more habitable for other oxygen-using organisms. It is also one of the most common fossils in the Gunflint chert.^[1]

References

^ ^a ^b Palmer, Douglas; et al. (2009). Prehistoric Life: The Definitive Visual History of Life on Earth (first American ed.). New York City: DK Publishing. p. 59. ISBN 978-0-7566-5573-0.