Geochronology of the Letete and Waweig formations, Mascarene Group, southwestern New Brunswick
Bibliographic record
Abstract
Felsic tuffs from the Letete and Waweig formations of the Mascarene Group in southwestern New Brunswick have essentially identical U-Pb ages of 437 ± 7 and 438 ± 4 Ma and were, therefore, both deposited in the Llandoverian of the Early Silurian. These radiometrically determined ages bring into question the validity of assigning Late Silurian ages to rock units in the Mascarene Basin based on the presence of Salopina sp. The new data also indicate that rate of deposition for the volcanic sequences in the Mascarene Basin of New Brunswick is similar to that of the classic sections in coastal Maine. RESUMÉ Les tufs felsiques des formations de Letete et de Waweig du groupe de Mascarene dans le Sud-Ouest du Nouveau-Brunswick ont des âges au U-Pb essentiellement identiques de 437 ± 7 et 438 ± 4 Ma; ils se sont par conséquent déposés dans les deux cas au cours du Valentien, pendant le Silurien précoce. Ces âges radiométriques remettent en question la validité de l'attribution d'âges remontant au Silurien tardif aux unités rocheuses du bassin de Mascarene basée sur la présence de l'espèce Salopina. Les nouvelles données révèlent par ailleurs que le rythme de sédimentation des séquences volcaniques dans le bassin de Mascarene au Nouveau-Brunswick est semblable à celui des sections classiques le long du littoral du Maine.
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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 | 0.002 | 0.002 |
| 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) | 0.001 | 0.000 |
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".