Stratigraphy of the Harper Ranch Group and tectonic history of the Quesnel Terrane in the area of Kamloops, British Columbia
Bibliographic record
Abstract
The late Paleozoic Harper Ranch Group (Harper Ranch Group) of south-central British Columbia is a >3 km thick sedimentary succession consisting mostly of marine siliciclastics and carbonates.In the area of Kamloops, the Harper Ranch Group comprises the oldest rocks of Quesnel Terrane.Here, the Quesnel Terrane comprises three unconformity bound successions of island-arc affinity: the Harper Ranch Group, the Late Triassic Nicola Group, and the Early Jurassic Rossland Group.Each succession records subduction-related volcanism and associated sedimentation.Three new formation-rank stratigraphic units are recognized in the Harper Ranch Group.The clastic Tk'emlups Formation, overlain successively by the predominantly carbonate South Thompson and McGregor Creek formations are all formally defined with type sections and detailed descriptions.The South Thompson Formation records volcanic quiescence, the end of volcano-sedimentary sedimentation of the Tk'emlups Formation, and development of arc flanking carbonates in the Late Mississippian.Pre-Early Permian uplift and erosion of Harper Ranch Group units are implied by the character and lithology of the Permian McGregor Creek Formation, a secondary chert-rich carbonate platform succession.Upper Permian to Middle Triassic rocks are not recognized in the area.The Nicola Group records renewed arc-related volcanism, sedimentation, and plutonism in the Late Triassic.The Rossland Group, represented by conglomerate, agglomerate and undifferentiated volcanics, represents a third, Early Jurassic, island-arc succession.Rocks of the Rossland Group unconformably overlie those of the McGregor Creek Formation.New biostratigraphic data from each of the Harper Ranch, Nicola, and Rossland groups, in concert with map relationships, provide time constraints for the tectonic evolution of Quesnel Terrane.iii For my parents and grandparents.Their support was integral to this achievment.
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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 | 0.003 |
| Science and technology studies | 0.002 | 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) | 0.005 | 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".