Oligocene benthic foraminifera from the Paleogene Wenonah Canyon, Scotian Shelf – normal versus canyon assemblages
Bibliographic record
Abstract
Petro-Canada Shell Wenonah J-75 well was drilled at the site of the mid Cenozoic "Wenonah Canyon" under the Scotian Shelf. Benthic foraminiferal assemblages recovered from sidewall core samples in the Oligocene section are unusually low in species diversity, though high in numbers of specimens. Such oligospecific assemblages may be the result of unusual hydrological factors in the canyon sediments at the time of deposition. In marked contrast, a nearby well, Canterra et al. Whycocomagh N-90, drilled outside the deepest canyon area, contains normal, more diverse, benthic slope assemblages. A seismic section acquired near the Wenonah site shows the informally designated Ypresian Acadia chalk to be truncated by canyon development. Planktic foraminifera of early Ypresian age do occur in Wenonah J-75, however, suggesting that the Acadia chalk may in fact be confined to the upper Ypresian. RÉSUMÉ Le puits Wenonah J-75 de Petro-Canada/Shell a été foré à l'emplacement du « canyon Wenonah » du Cénozoïque moyen, sous la Plate-forme Scotian. Les assemblages de foraminifères benthiques récupérés des échantillons de carottes latérales dans la section de l'Oligocène, présentent une diversité d'espèces exceptionnellement faible, malgré le nombre élevé de spécimens. Ces assemblages oligospécifiques pourraient être dus à des facteurs hydrologiques inhabituels dans les sédiments du canyon au moment du dépôt. À l'opposé tout à fait, un puits proche, le puits Whycocomagh N-90, de Canterra et coll., foré à l'extérieur du secteur le plus profond du canyon, renferme des assemblages de pentes benthiques plus diversifiés et normaux. Une section sismique prélevée près de l'emplacement de Wenonah révèle que la craie officieusement désignée craie yprésienne d'Acadia est tronquée par le développement du canyon. Des foraminifères planctoniques de la période de l'Yprésien précoce sont présents dans le puits Wenonah J-75, ce qui laisse toutefois supposer que la craie d'Acadia pourrait en fait être confinée à l'Yprésien supérieur.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".