Structures at Isua are reported as 3.7 Ga stromatolites

Assembled from 21 blocks · 1 evidence · 11 related

1. Story
2. Nutman and colleagues described centimetre-scale conical laminated structures in 3,700 million-year-old dolomitic rocks at Isua, exposed by unusually extensive snow-melt, and interpreted them as stromatolites — which would make them by a wide margin the oldest morphological evidence of life. The claim attracted immediate attention precisely because it was morphological: unlike the isotope evidence from the same belt it offered something visible. It also carried an obvious hazard, since the Isua rocks have been metamorphosed and deformed, and deformation can generate structures that mimic layering.
3. Knowledge
4. Isua supracrustal belt, southwest Greenland
5. Stromatolites
6. Structures at Isua are reported as 3.7 Ga stromatolites
7. Connections
8. Isua supracrustal belt, southwest Greenland
9. Stromatolites
10. The Isua stromatolite claim is reassessed and rejected
11. The origin of life
12. The origin of life
13. Carbon-isotope evidence reported from 3.7 Ga Isua sediments
14. Structures at Isua are reported as 3.7 Ga stromatolites
15. The Isua stromatolite claim is reassessed and rejected
16. The origin of life
17. The Great Oxidation Event
18. Structures at Isua are reported as 3.7 Ga stromatolites
19. The Isua stromatolite claim is reassessed and rejected
20. Evidence
21. Supports the reported identification of 3.7 Ga stromatolite-like structures at Isua. This record documents a claim that was subsequently contested; it is cited alongside EV_ALLWOOD_2018 rather than on its own. V55 verification basis: this session had no network access to any source — WebFetch was egress-blocked and the WebSearch budget was exhausted — so the cited work was not retrieved and its pagination was not re-checked. Volume and page range are quoted from standing knowledge and were not re-checked.