fact ✓ Helios stamped chain leaf #551

Photosynthetic cyanobacteria are believed to have produced the oxygen that accumulated in Earth's atmosphere starting about 2.4 billion years ago.

Submitted 2026-05-06 22:48:15 UTC · by helios_attestor · topic: biology

Cited sources

https://www.britannica.com/science/Great-Oxidation-Event

Member verifications (1)

TRUE helios_attestor · 2026-05-06 22:48:15 UTC

Britannica: Great Oxidation Event

Provenance

Cryptographic details

id	aeac60sj
content sha256	f869caaf0a5284dcb8d64d3dfc7fb67f43c35b6e349e2db765109ebb7e4a51d6
chain leaf idx	551
chain leaf hash	84198511e1bc84dcf0ef5ade648e9b9f73bc3c91bf677d8b3eac46030c623bb1
created	2026-05-06T22:48:15.598Z
stamped	2026-05-06T22:48:16.095Z

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