A PALEOENVIRONMENTAL REAPPRAISAL OF THE PENNSYLVANIAN (BASHKIRIAN-MOSCOVIAN) SOUTH BAR FORMATION AND LOWER SYDNEY MINES FORMATION OF CAPE BRETON, ATLANTIC CANADA
Bibliographic record
Abstract
The c. 1-km-thick, Pennsylvanian South Bar Formation (SBF) in the Sydney, Nova Scotia area was formed in a paleoequatorial, coastal alluvial plain setting. Fluvial channel and overbank facies preserve a transition from deposits of perennial streams in a permanently waterlogged setting to those of more strongly seasonal fluvial environments that experienced periodic desiccation upward through the formation. Paleosols are representative of gleyed conditions until the top 100 m of the formation, when primary reddening indicates more freely or at least seasonally drained conditions. The overlying lower Sydney Mines Formation (SMF) preserves a more diverse array of facies, recording fluvial channel, overbank and lacustrine/paralic conditions on a coastal plain. The SMF preserves well-developed cyclicity entailing alternations among deposits of humid to semi-arid/arid conditions. Paleosols range from paleo-gleysols, through vertisols and oxisols to calcisols. In this reappraisal, we find that the formative rivers of the SBF were characterized by progressively higher discharge variance towards the top of the formation, continuing into the overlying SMF, where differences in fluvial style (low vs. high discharge variance) correlate with interpreted paleoclimatic fluctuations. These styles covary with other indices of cyclical paleoclimatic change, including upward fluctuations in Chemical Index of Alteration (CIA) values at the top of the SBF and into the overlying SMF. Geochemical data suggest that the paleoenvironment became progressively more seasonal and stressed upward through the Moscovian of Atlantic Canada, leading to a crisis near the Moscovian/Kasimovian boundary, a time of widespread turnover in paleoflora.
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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 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".