Discussion on ‘The Neoproterozoic glacial record in the Río de la Plata Craton: a critical reappraisal'
Bibliographic record
Abstract
In a recent article, Pazos et al . (2008, p. 343) claim that ‘the Zanja del Tigre Formation (Uruguay) represents a glacial influenced succession deposited during the Neoproterozoic, correlative with one of the glaciations described in the Kalahari Craton, prior to Kalahari–Rio de la Plata assembly in the proto-western Gondwana margin'. However, we question the two lines of evidence that Pazos et al . (2008) put forth in their paper to constrain the age of this unit and to support a glacial event. Pazos et al . (2008, p. 350, and fig. 4) consider the Zanja del Tigre Formation as part of the Lavalleja Group. This view, however, is incompatible with existing interpretations. According to the latest compilations of the geology of Uruguay (Bossi et al . 1998; Bossi & Ferrando 2001), the Zanja del Tigre Formation is part of the Carape Group, which is stratigraphically below the Lavalleja Group. In fact, the Carape and the Lavalleja groups have long been considered independent lithostratigraphic units (e.g. Bossi & Navarro 1991), perhaps even belonging to different ‘terranes' or ‘blocks' (Gaucher et al . 2004). A recent geochronological study (not available to Pazos et al . 2008, at the time of writing) based on detrital …
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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 | 0.005 | 0.006 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.005 | 0.015 |
| Scholarly communication | 0.005 | 0.007 |
| Open science | 0.005 | 0.004 |
| Research integrity | 0.006 | 0.008 |
| Insufficient payload (model declined to judge) | 0.004 | 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".