Geology of the Spatsizi River map area, north-central British Columbia
Bibliographic record
Abstract
Spatsizi River map area is underlain by early Carboniferous to Quaternary rocks. The primary tectonostratigraphic elements are Stikinia, Bowser Basin, and Sustut Basin. The primary structural feature is the Skeena Fold Belt. Stikinia is composed of Carboniferous to early Middle Jurassic clastic, volcanic, and intrusive rocks. It is overlain by the Bowser Lake Group, a late Middle Jurassic to mid-Cretaceous clastic overlap assemblage. The Bowser Basin resulted from closure of the Cache Creek Ocean that lay between Stikinia and Ancestral North America. Sediment was deposited in amagmatic submarine fan, slope, shelf, deltaic, and low- and high-energy fluvial environments. The distribution of fossils and lithofacies assemblages define an overall regressive basin history with facies boundaries migrating southwest, away from the Cache Creek source. A conservative minimum estimate of thickness of the group is 5000 m. The Sustut Basin is a nonmarine, fluvial basin northeast of the Bowser Basin. The Sustut Group, of Barremian, Aptian, or Albian, to early Maastrichtian age, is at least 2000 m thick. Initial deposits were mica-rich and had an eastern (Omineca Belt) source. The appearance of abundant chert clasts in the lower formation signals initiation of a western, Bowser Lake Group, source. The change in source area illustrates impact of the evolving Skeena Fold Belt, which was active in the Early and Late Cretaceous. Folds and thrust faults involve strata as low as Stikinia, and most verge northeast. The Skeena Fold Belt terminates to the northeast in a triangle zone within the Sustut Basin.
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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 | 0.004 |
| Science and technology studies | 0.002 | 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) | 0.027 | 0.004 |
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".