Centimetre-scale structures reported from 2.1 Ga Gabonese shales

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El Albani and colleagues described pyritised, centimetre-scale structures with lobed margins and radial internal fabric from 2.1 billion-year-old black shales of the Francevillian Basin in Gabon, and interpreted them as colonial organisms showing coordinated growth. If accepted, the claim moves macroscopic organisation back by more than a billion years and places it immediately after the oxygenation of the atmosphere. The interpretation remains disputed on two grounds: that the structures could be abiotic pyrite growths or sedimentary features, and that nothing comparable is known for roughly the next billion years, which is difficult to reconcile with a continuous lineage.

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