The larger catalogue for the whole series is on the parent page, the origin of life: the literature. Working notes are in
abiogenesis/research/earliest-life-and-timing.md.
Sources cited
| Source | What it is | Access | Direction |
|---|---|---|---|
| Mojzsis et al. 1996 | Isotopically light carbon in ~3,800 Ma Isua apatite: "no known abiotic process can explain the data." Now largely abandoned. | Opened | complicates |
| Brasier et al. 2002 | The Apex chert microfossils reinterpreted as "secondary artefacts formed from amorphous graphite." | Opened | supports the caution |
| Lineweaver & Davis 2002 | The constraint from rapid biogenesis, with its load-bearing assumption flagged by the authors. | Opened | complicates |
| Spiegel & Turner 2012 | Rapid biogenesis "is consistent with an arbitrarily low intrinsic probability of abiogenesis for plausible uninformative priors." | Opened | complicates, against both camps |
| Boehnke & Harrison 2016 | Partial argon loss from a declining flux manufactures a false 3.9 Ga peak. | Opened | undercuts the no-time argument |
| Bottke & Norman 2017 | The counterweight: a discrete early episode defended, with clustering in several isotope systems. | Opened | complicates |
| Zellner 2017 | The same verdict from the sample record: "the timeline for the assembly of the first biomolecules has been lengthened." | Opened | undercuts |
| Dodd et al. 2017 | The Nuvvuagittuq filaments, in a rock whose age spans 3,750 to 4,290 Ma. | Opened | complicates |
| Allwood et al. 2018 | The Isua stromatolites rebutted in Nature. | Opened | supports the caution |
| Schopf et al. 2018 | The ion-probe carbon isotope reply on the Apex fossils, taxon by taxon. | Opened | complicates |
| Pearce et al. 2018 | The window for chemistry: 200 to 800 million years. | Opened | undercuts |
| Moody et al. 2024 | The early complex LUCA, and the sentence discarding the bombardment constraint. | Opened in full | complicates |
| Jenewein et al. 2025, PNAS 122:e2413816122 | Cell-shaped objects with organic walls from silica and cyanide, with the authors' own warning about reading them as evidence of life. | Opened in full | supports the caution |
| Westall et al. 2025 | The robust floor: Dresser Formation and Strelley Pool material at about 3.48 Ga. | Opened | complicates |
| Yue et al. 2026 | Chang'e-6 farside basalts and norites dated; the impact rate "supports a smooth decay instead of abrupt changes." Post-cutoff. | Opened | undercuts |
| Zhang et al. 2026 | 28 single-clast argon ages from farside impact melts; only two fall between 4.0 and 3.7 Ga. Post-cutoff. | Opened | undercuts |
Considered and not used
- van Zuilen et al. 2002, the reanalysis that overturned the Isua apatite claim. Its result is stated; the paper was not opened here, and the abandonment is reported from the later literature.
- The Jack Hills 4.1 Ga graphite inclusion paper. Described as resting on a single grain out of more than ten thousand; the primary was not opened and no quotation is printed.
- Papineau & O'Neil 2026, a critical re-evaluation of Nuvvuagittuq by its own discoverers. Surfaced in the 2026 search and not opened.
- Wogan, Catling & Zahnle 2024, Astrobiology 24, on the timing and likelihood of impact-driven biopoiesis. Its 90% and 20% figures are conditional on assuming prebiotic chemistry required a post-impact atmosphere, so they are not used. Handled in the Miller-Urey article.
- Marchi's cratering work, cited by others for the number of large Hadean impacts. Reaches this article through Wogan and is used only there.
Open questions
- Whether the Apex chert dispute has a resolution. Schopf answered Brasier in 2018 and no adjudication was found.
- Whether the farside result is now accepted by the group defending a discrete early episode. No reply was found, and the two 2026 papers postdate the last exchange.
- The window figure of 200 to 800 million years should be re-derived rather than quoted, since its endpoints depend on which habitability constraint is assumed.