Response of Late Carboniferous tropical vegetation to transgressive–regressive rhythms at Joggins, Nova Scotia
Bibliographic record
Abstract
Fossil plant assemblages are described in their sequence stratigraphic context from the Upper Carboniferous (Langsettian) Joggins Formation of Nova Scotia to elucidate ecosystem response to transgressive–regressive rhythms. Results show that rising base level resulted in retrograding submerged coastal mires co-dominated by Lepidodendron and Lepidophloios , which were replaced by short-lived Paralycopodites communities immediately following mire drowning. Extensive brackish bays existed during early highstand, distally fringed by gymnospermous and putative progymnospermous coastal and/or upland vegetation. Late highstand bay filling generated prograding distributary wetlands dominated by flood-disturbed lycopsid–pteridosperm–sphenopsid communities, and locally by cordaite mangroves. As base level fell, well-drained alluvial plains were dominated by fire-prone cordaite and/or Sigillaria communities, which persisted until the next phase of base-level rise. This rhythmic ecosystem succession repeatedly occurred on a c . 50–200 ka time scale, and was probably driven by glacial–interglacial climate rhythms.
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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 | 0.001 | 0.001 |
| 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 | 0.001 |
| 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 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".