Neoproterozoic-Cambrian stratigraphy of the Mackenzie Mountains, northwestern Canada, part I: Ediacaran measured sections and updated lithostratigraphy, NE Sekwi Mountain map area (NTS 105-P)
Bibliographic record
Abstract
This report updates Ediacaran stratigraphic assignments in the northeastern part of NTS map area 105-P (Sekwi Mountain map area). A previous report (MacNaughton et al., 2008) included graphic logs for three measured sections in this region. The sections were thought to encompass the uppermost part of the Sheepbed Formation, a platform facies of the Gametrail Formation, the lower and middle members of the Backbone Ranges Formation, and the basal part of the upper member of the Backbone Ranges Formation. The sections were considered to span much of the Ediacaran and possibly the basal Cambrian. Based on more recent bedrock mapping, as well as revisions to regional stratigraphic correlations, the measured sections from the earlier report are reassessed. An interval previously treated as a sandy, shallow-marine upper part of the otherwise shale-dominated Sheepbed Formation is reassigned to the lower member of the Backbone Ranges Formation. The contact between the two units corresponds to an upward change from dark grey to brown or rusty weathering colours. In the area where the sections were measured, the 'Sheepbed carbonate' is not present at the Sheepbed-Backbone Ranges contact, nor is the shale-rich Nadaleen Formation (a.k.a. 'June beds'), although these units are commonly present at this level in other parts of the Mackenzie Mountains. A thick package of shallow-marine, grey sandy dolostone and dolomitic sandstone, previously assigned to the Gametrail Formation is also placed in the lower member of the Backbone Ranges Formation, based on comparison with other sections regionally. In light of recent studies, measured strata in the basal part of the upper member of the Backbone Ranges Formation probably are Ediacaran rather than Cambrian. Previously unpublished descriptive notes are provided for the three measured sections.
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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 | 0.001 | 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".