Copyright © Atlantic Geology, 2007 A Cordaixylon axis from well-drained alluvial plain facies in the Lower Pennsylvanian Joggins Formation of Nova Scotia
Bibliographic record
Abstract
Plant remains showing preservation of cellular anatomy are rare in the Lower Pennsylvanian Joggins Formation of Nova Scotia. Here I report an anatomically preserved cordaitalean axis that shows endarch maturation and a sympodial vascular architecture. The specimen belongs to the morphogenus Cordaixylon, but in the absence of extraxylary tissue or attached fertile material, it cannot be assigned to a species. Together with a previously reported Mesoxylon axis with mesarch and non-sympodial vasculature, the new discovery demonstrates the existence of both major organizational types of cordaitalean at this locality. Previous reports have identified Cordaixylon as a plant that preferred peat mire environments. In this paper, the morphogenus is recorded from well-drained alluvial plain facies, thus extending knowledge of its ecological range. RÉSUMÉ Les vestiges de plantes présentant une préservation de l’anatomie cellulaire sont rares à l’intérieur de la Formation du Pennsylvanien inférieur de Joggins, en Nouvelle-Écosse. Je fais part dans les présentes d’un axe de cordaitaléen anatomiquement préservé qui affiche une maturation circulaire à partir de l’intérieur et une architecture vasculaire sympodiale. Le spécimen fait partie du morphogenre Cordaixylon, mais en l’absence de tissu extraxylaire ou de matière fertile y étant fixée, on ne peut pas le rattacher à une espèce donnée. La nouvelle découverte, conjuguée à un axe de Mesoxylon précédemment signalé qui comportait une vasculature non sympodiale à éléments en spirale internes, révèle l’existence des deux principaux types structuraux de cordaitaléens à cet emplacement. Des rapports antérieurs avaient défini le Cordaixylon en tant que plante préférant les environnements à bourbiers de tourbe. Le présent document fait état de l’observation du morphogenre d’un faciès de plaine alluviale bien drainée, ce qui étend notre connaissance de son aire de distribution écologique. [Traduit par la redaction]
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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 | 0.000 |
| 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 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".