Basin-Scale Stratigraphic Architecture of Upstream Fluvial Deposits: Jurassic–Cretaceous Foredeep, Alberta Basin, Canada
Bibliographic record
Abstract
Abstract: The fluvial stratigraphic architecture of the Late Jurassic–Early Cretaceous Monteith Formation, specifically the Monteith A, in the Alberta Basin is documented with a series of maps, cross sections, and core descriptions from 550 wells over an area of > 17,500 km2. The extensive study area provides a unique perspective on basin-scale stratigraphic architecture and sediment distribution of a sandy fluvial system in a foredeep. The stratum, > 150 m thick in places, is divided into three mappable intervals. The proportion of channel sandstone relative to overbank sediment is highest in the basal unit and progressively decreases upward, likely as a result of increasing accommodation associated with orogen growth. Conglomeratic lenses in outcrop indicate deposition from a persistent point source that tapped a drainage area > 100,000 km2. Along-strike sandstone distribution within the units is predictable as the thickest, most amalgamated, and coarsest sandstone deposits are concentrated nearest to the point source. Distal to the point source, isolated channel belts and overbank material are more commonly preserved. The maximum channel-belt dimensions are calculated to range from 4.1 to 12.6 m thick and from 514 to 2851 m wide with an average of 8.5 m and 1527 m, respectively. Sediment distribution patterns, stratigraphic architecture, and tectonic setting suggest that the deposit is a fluvial fan, or more generally a distributive fluvial system (DFS). The stratigraphic architecture observed in the Monteith Formation is inferred to be characteristic of DFSs in an upstream position and provides one of the first subsurface examples of such a system. The overall increase of preservation of overbank deposits upward is consistent with previous models of basin-scale upstream fluvial stratigraphic architecture, but the along-strike persistence and stacking of channel belts directly adjacent to a point source provides unique insight into the basin-scale stratigraphic evolution of upstream fluvial systems.
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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 | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 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".