A palynological analysis of middle Cretaceous strata in the Hume River section, Northwest Territories, Canada
Bibliographic record
Abstract
The Hume River section northwest of the town of Norman Wells, Northwest Territories consists of a 2-km-thick succession of Cretaceous strata deposited in a foreland basin ahead of the advancing Mackenzie Mountains thrust-and-fold belt. Rocks in the section have been assigned (from bottom to top) to the Martin House, Arctic Red, Slater River and Trevor formations. The Martin House Formation rest unconformably on Paleozoic strata, and an unconformity separates the Arctic Red and Slater River formations. In terms of paleoenvironments, the section represents fluctuating fully marine to non-marine deposits near the margin of the Western Interior Seaway. Previous age determinations have encompassed an Aptian to Turonian age range for the section as a whole. My analyses indicate an early to middle Albian age for the Martin House Formation, a middle to late Albian age for Arctic Red Formation (which accords with a late Albian U-Pb radiometric date for the unit), a late Albian age for the lowest part of the Slater River Formation (in contrast to Cenomanian age determined by the most recent foraminiferal analyses), and a Cenomanian or younger age for the upper part of the Slater River Formation and for the Trevor Formation. I found no conclusive evidence for an age younger than Cenomanian. The Albian-Cenomanian boundary may be within the basal part of the Slater River Formation rather than at the unconformity between that formation and the underlying Arctic Red Formation. Interesting parallels can be drawn with lithological units and dinocyst assemblages in other parts of the Western Interior Basin, notably in northern Alberta. Perhaps there too, the Albian-Cenomanian boundary is within the basal part of the Fish Scales Marker Bed (equivalent to the Slater River Formation) rather than at its base.
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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 | 0.003 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| 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".