Cross-Bedded Woody Debris From A Pliocene Forested River System In the High Arctic: Beaufort Formation, Meighen Island, Canada
Bibliographic record
Abstract
Abstract: Cross-bedding, the inclined internal stratification that records the migration of certain transverse sedimentary bedforms, is nearly ubiquitous in current-transported bedload sediments. Although examples of the structure are known from inorganic clastic sediments and sedimentary rocks from practically all depositional environments and intervals of geologic history, here we report cross-bedded lenses that are composed wholly or significantly of woody debris, in Pliocene alluvium of the Beaufort Formation in the Canadian High Arctic. The uniqueness of cross-bedded woody debris has hitherto been overlooked, but we demonstrate that, in the entire Phanerozoic record, it is apparently restricted to alluvium deposited during a warm climatic interval that permitted the growth of boreal-type forests within 10° latitude of the North Pole. The marked spatiotemporal restriction of cross-bedded woody debris implies that there may be environmental factors, unique to polar forests, which promote the subaqueous transport of large amounts of fine woody debris as fluvial bedload. We propose a non-uniformitarian conceptual model for the formation of cross-bedded woody debris in forested polar rivers whereby an exceptional abundance of woody debris could accumulate, and become saturated and denser than water, due to reduced decomposition on forest floors that were subject to prolonged periods of darkness and subzero temperatures.
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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 | 0.002 | 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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".