The Carboniferous evolution of the Maritimes Basin complex, Atlantic Canada
Bibliographic record
Abstract
The Maritimes Basin complex of Atlantic Canada preserves a thick stratigraphic succession deposited within a low-latitude, predominantly continental setting during the Late Paleozoic. This study examines the utility of using such successions for paleoclimate analysis, with specific reference to changes in fluvial style. Traditionally, studies concerning the paleoclimate of continental strata have been limited to analyses of paleopedologic, geochemical proxy, and floral data. The Carboniferous succession of Atlantic Canada is excellently exposed in coastal cliffs and intertidal platforms allowing for a detailed examination of fluvial style and paleoclimate variation. Modern rivers in the subhumid and semiarid tropics preserve a suite of features that are distinct from those in humid and arid environments. These features include an abundance of sedimentary structures formed under Froude transcritical to supercritical flow conditions and the presence of in situ vegetation growing within the channel environment. This fluvial style is indicative of prolonged low-flow conditions punctuated by intense precipitation events in a strongly seasonal climatic setting. Fluvial channel bodies within the Maritimes Basin complex preserve a remarkably similar style compared with these modern systems suggesting that a subhumid, strongly seasonal paleoclimate was the dominant imprint on the preserved successions. Strongly seasonal deposits are concentrated within four discrete stratigraphic intervals (E1-E4), ranging in duration from 2-6 m.y. These intervals are correlated across the entire basin complex and between basins characterized by markedly different tectonic regimes, which indicates that a coherent regional climate signal is recorded. Intervals are separated by deposits characteristic of humid and arid river systems, and the alternation between these different fluvial styles implies that several pronounced, long-term changes in precipitation and runoff regimes occurred during the Carboniferous within region. Furthermore, these intervals broadly coincide with major periods of southern hemisphere glaciation, which suggests that glaciation had a profound and controlling effect on paleotropical climate. The recognition of punctuated periods of strongly seasonal paleoclimate represented by the newly described fluvial style may aid in refining the paleoclimate evolution of similar successions elsewhere in the paleotropics.
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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) | 0.000 | 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".