A Late Devonian Porolepiform fish (Holoptychius) and the age of the Kennebecasis Formation, southern New Brunswick, Canada
Bibliographic record
Abstract
The occurrence of Holoptychius from southern New Brunswick, Canada, adds a new locality to eastern North America and suggests the assignment of a Late Devonian age for the Kennebecasis Formation. The formation has been considered Early Carboniferous based on a plant assemblage including Lepidodendron corrugatum and Aneimites acadica. Plant fossils likely originate from rocks overlying the Kennebecasis Formation, and are part of an unmapped westward extension of the Carboniferous Albert Formation to the Saint John area. The palaeobiogeographic implications of Holoptychius suggest the cryptic presence of a classic Late Devonian fish assemblage in southern New Brunswick and the possibility that tetrapod or near-tetrapod remains may be recovered from fossil-bearing horizons within the Kennebecasis Formation.
 
 RÉSUMÉ
 
 La manifestation de l’Holoptychius dans le Sud du Nouveau-Brunswick, Canada, ajoute un nouvel emplacement dans l’Est de l’Amérique du Nord et permet d’attribuer l’âge du Dévonien tardif à la Formation de Kennebecasis. La Formation était considérée comme une unité du Carbonifère précoce d’après un assemblage végétal comprenant le Lepidodendron corrugatum et l’Aneimites acadica. Les fossiles végétaux proviennent probablement de roches recouvrant la Formation de Kennebecasis et font partie d’un prolongement non cartographié de la Formation carbonifère d’Albert en direction ouest jusqu’à la région de Saint-Jean. Les répercussions paléobiogéographiques de la manifestation de l’Holoptychius laissent supposer la présence cryptique d’un assemblage de poissons classique du Dévonien tardif dans le Sud du Nouveau-Brunswick et la possibilité d’une récupération de restes de tétrapodes ou de quasi-tétrapodes des horizons fossilifères à l’intérieur de la Formation de Kennebecasis.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".