Integrated Ichnology, Sedimentology and Stratigraphy of the Along-Strike Changes in Parasequences of the Lower Cretaceous Boreal Seaway, Central Alberta, Canada
Bibliographic record
Abstract
The along-strike depositional variability recorded in the coarse-grained parasequences that prograded into the Lower Cretaceous Boreal Seaway of Alberta is understudied. High-resolution facies analysis of subsurface core can be used to differentiate non-deltaic (strandplain) shoreface deposits from contemporaneous wave-dominated deltaic complexes. In the western part of the basin, facies are strongly overprinted by storm processes. Successions are dominated by sporadically burrowed, stacked sandy tempestites, passing upward into current ripple and trough cross-stratification, and capped by low-angle planar-stratified sandstones, pebbly sandstones and, locally, conglomerates. Subtle ichnological and sedimentological characteristics captured in units preserved between tempestites indicate the local presence of river-sediment influx. At point source locations, conglomerate beds are more abundant. Roughly time-equivalent strata lying along the southeastern margin of the basin exhibit a marked and progressive decrease in the degree of storm influence. Sandstones show laminated-toburrowed bedding with composite trace fossil suites attributable to the Skolithos Ichnofacies and the Cruziana Ichnofacies. Foreshore conglomerates are less abundant eastward, and the system appears more brackish. In these positions, storm influence is less effective in masking deltaic effects, and facies characteristics distinctive of river discharge can be discerned and applied to more strongly storm-influenced successions to the west. Understanding and predicting the along-strike variations in parasequence character will constitute an integral step towards understanding the distributions of economic oil and gas in the Boreal Seaway of central Alberta. In the west, in particular, point-source accumulations of fluvially supplied gravel can be better predicted by carefully delineating these deltaic influences.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".