Biostratigraphy of the sekwi and rockslide formations (lower to middle Cambrian; Wrigley lake and Sekwi mountain areas; NTS 95M and 105P, Northwest Territories, Canada); implications for basin development and regions correlation
Bibliographic record
Abstract
The lower and middle Cambrian, carbonate-dominated Sekwi and Rockslide formations \nwere deposited in the Selwyn basin, a Neoproterzoic-Paleozoic depositional entity that occupied \nmost of the ancestral western margin of Laurentia and spans parts of modern-day Yukon and \nNorthwest Territories. Biostratigraphic data and limited chemostratigraphic data (δ13Cvpdb) from \ntwo Sekwi Formation sections in the Sekwi Mountain map-area (NTS 105P) are used to refine \nthe current understanding of the spatial and temporal distribution of trilobite faunas in the area \nand to correlate the Sekwi Formation with other units throughout the Canadian Cordillera. Two \nspecies-based trilobite biozones (in ascending order: the Nevadia addyensis and Nevadella \neucharis zones) previously best known from Arizona, California, and Nevada are documented in \nthe lower Sekwi Formation, and a new genus-based assemblage zone, the Elliptocephala Zone, is \nproposed for the lower Dyeran of the Selwyn basin and surrounding areas. Trilobite data from \nthree sections in the Wrigley Lake area (NTS 95M) are used to determine the chronology of \nbasin events adjacent to the Redstone arch during the early and middle Cambrian, and \nlithostratigraphic data from other locations in the same map area is discussed to illuminate the \nnature of the basin events. There is evidence for two tectonic events during the late (traditional) \nearly Cambrian and earliest middle Cambrian: (1) Event I, a regional uplift that eroded strata \nproximal to the Redstone Arch, and (2) Event II, a regional deepening event that heralded the \nonset of Rockslide Formation deposition. Trilobite biostratigraphy remains a mainstay of \ncorrelation in the Cambrian and is a powerful tool. However, further refinement is needed for the \ncurrent biostratigraphic synthesis of the Cambrian of Laurentia, and biostratigraphy is enhanced \nwhen combined with chemostratigraphic curves.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".