FRAMBOIDAL PYRITE SHROUD CONFIRMS THE ‘DEATH MASK' MODEL FOR MOLDIC PRESERVATION OF EDIACARAN SOFT-BODIED ORGANISMS—A REPLY
Bibliographic record
Abstract
Thin, laterally extensive veneers of framboidal pyrite on fossiliferous bedding planes in eastern Newfoundland, Canada, provide evidence for post-burial microbially mediated pyritization of the seafloor in the late Ediacaran Period (Liu 2016). Pyrite is inferred to have formed on the external surfaces of soft-bodied organisms and microbial matgrounds as a result of bacterial sulfate reduction, consistent with the ‘death mask' taphonomic model for Ediacaran moldic preservation (Gehling 1999). Retallack (2017) accepts the evidence presented by Liu (2016) for early diagenetic pyritization of bedding planes in Newfoundland, and seems to offer at least tacit acceptance of evidence for modern oxidation of that pyrite, its widespread occurrence in global Ediacaran localities, and the potential influence of sedimentary pyrite burial on global Ediacaran oxygen concentrations. However, Retallack questions whether the presence of such pyrite veneers can be taken to demonstrate the ‘death mask' taphonomic model, and specifically queries the source of the observed pyrite.
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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 | 0.006 | 0.025 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.002 | 0.010 |
| Scholarly communication | 0.003 | 0.007 |
| Open science | 0.003 | 0.003 |
| Research integrity | 0.013 | 0.024 |
| Insufficient payload (model declined to judge) | 0.005 | 0.004 |
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".