The "medullosalean forest" at the Lloyd Cove Seam (Pennsylvanian, Sydney Coalfield, Nova Scotia, Canada)
Bibliographic record
Abstract
From a ca. 4,200 m+2 mining area of the roof shale of the Lloyd Cove Seam, Sydney Coalfield, Nova Scotia, an alethopterid-linopterid assemblage was discovered. Physically associated with, and not connected with leaf fragments, is a great abundance of medullosalean axes and stems. They range in length from several to over 130 cm, with attached axes of similarly variable lengths. Among them is a 130 cm long stem or trunk with "naked" 4 — 6 cm wide petioles in life position that are preserved for a maximum length of 60 cm; it represents an arborescent alethopterid, or "seed-fern" tree, 5 — 7 m tall, with as yet undetermined frond structure and foliar species. These fossil finds are interpreted to represent a "medullosalean forest" whose habitat was within the drier parts of a coastal-plain ecosystem of basal Stephanian age, at which time floral changes occurred at the Lloyd Cove Seam. This discovery is unequalled in the Canadian Carboniferous Maritimes Basin, where macrofossil collections date back to the 1840s. RESUMÉ On a découvert à l'intérieur d'un secteur d'extraction d'environ 4 200 mètres carrés du schiste supérieur de l'anse Lloyd, dans le terrain houiller de Sydney, en Nouvelle-Écosse, un assemblage d'aléthoptérides et de linoptérides. On trouve une grande abondance de tiges et d'axes médullosaléens physiquement associés, mais non rattachés, à des fragments de feuilles. Ceux-ci varient d'une longueur de plusieurs centimètres à plus de 130 cm, et comporte des axes de longueur similairement variables y étant rattachés. On trouve parmi eux une tige ou un tronc de 130 cm de longueur muni de pétioles « dénudés » de quatre à six centimètres de largeur, en position de vie, qui ont été conserves sur une longueur maximale de 60 cm. Cette tige représente un aléthoptéride arborescent, ou un arbre d'origine « ptéridospermale » de cinq à sept mètres de hauteur dont la structure des frondes et l'espèce foliaire restent encore indéterminées. Ces découvertes de fossiles sont interprétées comme des représentants d'une « forêt médullosaléenne » dont l'habitat se trouvait à l'intérieur des secteurs les plus secs de l'écosystème d'une plaine côtière remontant au début du Stéphanien, moment où sont survenus des changements floraux dans le filon de l'anse Lloyd. Cette découverte ne correspond à aucun équivalent dans le bassin carbonifère des Maritimes canadien, où les prélèvements de macrofossiles remontent aux années 1840.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".