The 13δCcarb curve from the Green Point succession in western Newfoundland, Canada and correlation of the GSSP section of the Cambrian-Ordovician boundary
Bibliographic record
Abstract
A new _13Ccarb curve from the Green Point section (Newfoundland, Canada), the GSSP of the Cambro-Ordovician Boundary, has been constructed because (1) no high-resolution carbon isotope profile was previously presented for the GSSP section and (2) the exact stratigraphic level of the Cambrian–Ordovician boundary, based on conodont biozonation, has become recently an issue of debate. The previously constructed C-isotope profile was based on lower resolution field sampling protocols. The δ13C values of 84 well-preserved micrite microsamples range from –4.7 ‰ to +1.7‰ (VPDB) and the profile reveals a composite negative shift (three peaks) of ~ 6.0 ‰.\nThe combination of C-isotope stratigraphy with biozonation provides a powerful tool of high-resolution global correlations.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.004 | 0.005 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".