Controls on the Timing and Evolution of Deep-Water Sedimentation in the Late Cretaceous Nanaimo Basin, British Columbia, Canada
Bibliographic record
Abstract
Submarine channel-system deposits of the Late Cretaceous Nanaimo Group, British Columbia, Canada record long-lived (>10^6 yr) deep-water sedimentation across a tectonically active basin margin. The integration of detrital zircon geochronology and stratigraphic analyses provides a unique opportunity to characterize the paleogeographic setting, source-to-sink relationships, and temporal evolution of this ancient sediment-routing system. Three contemporaneous conglomeratic channel-levee deposits are documented across a 135-km basin margin (strike-oriented) transect, indicating a period of widespread deep-water sedimentation. At one of these locations, continuous sediment transfer occurred for 21.1 ± 3.4 m.y. through an established submarine conduit that underwent a period of prolonged sediment bypass followed by a phase of channel aggradation. The timing and nature of deposition along the paleo-basin margin relates to geomorphic and tectonic changes in the basin and upstream drainage-systems, suggesting localized and regional controls on deep-water sediment delivery. These deposits provide insight into the geologic history of North America and sediment dispersal in tectonically active settings globally.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| 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) | 0.002 | 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".