Enigmatic tubular features in impact glass
Bibliographic record
Abstract
We describe the fi rst putative microbial trace fossils hosted in meteorite impact glass. \nWe conducted optical and scanning electron microscopy, energy dispersive X-ray spectroscopy, \nand Fourier transform infrared spectroscopy on postimpact tubular features hosted in \nimpact glasses from the Ries impact structure (Germany). The morphologies of the tubules \nare inconsistent with known mineralogical crystallization mechanisms, and combined with \nevidence of organic molecules suggest that these tubules cannot be formed through purely \nabiotic processes. The simplest and most consistent explanation of the data is that biological \nactivity played a role in the formation of the tubular textures in the Ries glasses, likely during \npostimpact hydrothermal activity. As impact glass is a ubiquitous substrate on rocky bodies \nthroughout the Solar System and likely common on the early Earth, the preservation of \nbiological activity in impact glass has signifi cant astrobiological implications for life on early \nEarth as well as for the search for life on other planets
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".