A detailed analysis of crevasse and overbank splay units in the Isaac formation (Windermere supergroup), of the southern canadian cordillera
Bibliographic record
Abstract
Crevasse and overbank splay deposits have been studied in detail within the Isaac Formation. Crevasse splay units (CSU) range from 10 – 20 m thick and extend the length of the study area (> 4 km). Strata within CSU comprise medium to coarse sandstone Ta-c turbidites that range from 0.2 – 1 m thick and are interstratified with thinly-bedded tc-e turbidites. In addition, distinctively matrix-rich sandstone form up to 7 m thick packages intercalated with the turbidites. CSU are interpreted to have been deposited outboard of a crevasse channel that most likely breached the outer-bend channel margin. Episodically a number of high-energy expanding flows went through a hydraulic jump and deposited the matrix-rich sandstone. At other times, or at least locally, flows remained subcritical and deposited the more common turbidites. OSU are common in the outer-bend distal levee setting of a significant channel-levee complex and encased by thinly-bedded turbidites. OSU consist of amalgamated normally graded to planar and cross-stratified medium-bedded, medium sandstone turbidites. OSU are 2 – 4 m thick and extend up to 1 km laterally, however, individual beds within units are laterally discontinuous. Lateral discontinuity is likely the result of rapid flow thinning, filling of topography on the distal levee, and to a lesser extent erosion. As a result, OSU comprise a complex arrangement of sandstone turbidites that commonly offlap and onlap one another locally creating high N:G within the predominantly muddy distal levee. OSU were deposited by turbidity currents that overtopped the channel margin without breaching the levee. These overspilling flows bypassed the proximal levee area because of the steep slope on the backside of the levee, and deposited much of their sediment on the reduced slope over the more distal levee.
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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 | 0.005 | 0.005 |
| 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".