Deposition of the Peavine Sandstone on the Peace River Arch and its relationship to transgressive-regressive cycles within the Beaverhill Lake Group, North-Central Alberta
Bibliographic record
Abstract
Summary Strata of the Beaverhill Lake Group in north-central Alberta were mapped using wireline logs and core. Primary lithostratigraphic mapping was supplemented with sequence stratigraphic methods to relate the timing of events between distinct depositional realms within the Beaverhill Lake Group across the province. Transgressive-regressive (T-R) cycles within the Waterways Formation in the east were correlated westward across the province to the southern flank of the Peace River Arch and northern Swan Hills area. Here, T-R cycles downlap or onlap Slave Point or Swan Hills carbonate complexes. Younger T-R cycles interfinger with siliciclastics shed from the Arch. During a period of relative sea-level fall, one such T-R cycle merges with a marked regressive sandstone package, known in industry reports as the Peavine sandstone (also the Beaverhill Lake sandstone). This particular T-R cycle is significant because its upper contact displays evidence for subaerial exposure on the Eastern Platform and has been correlated to similar exposures within the carbonate complexes of the Swan Hills area. On the Eastern Platform, evidence for subaerial exposure occurs at the top of a T-R cycle within the Moberly Member carbonates of the Waterways Formation. In the study area, this event is recognized as one of a few times during which sea level fell low enough to subaerially expose Frasnian-aged Beaverhill Lake Group carbonates. Evidence for lowering of relative sea level is further supported by linking this event with the Peavine sandstone regressive pulse on the Peace River Arch.
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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 | 0.001 | 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".