3600–3200 million years ago
The Paleoarchean (//; also spelled Palaeoarchaean (formerly known as early Archean)) is a geologic era within the Archaean. It spans the period of time —the era being defined chronometrically and not referenced to a specific level in a rock section on Earth. The name derives from Greek "Palaios" ancient. The oldest ascertained life form (well-preserved bacteria older than found in Western Australia) is from this era. 3,480 Ma: Fossils of microbial mat found in 3.48 billion-year-old sandstone discovered in Western Australia. The first supercontinent Vaalbara formed during this period.
- Borenstein, Seth (13 November 2013). "Oldest fossil found: Meet your microbial mom". AP News. Retrieved 15 November 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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- “Scientists reconstruct ancient impact that dwarfs dinosaur-extinction blast”, American Geophysical Union, April 9, 2014
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