NEW EARLY CAMBRIAN OLENELLINE TRILOBITES FROM THE SEKWI FORMATION, MACKENZIE MOUNTAINS, NORTHWEST TERRITORIES, CANADA, AND NEW INSIGHTS INTO OLENELLINID EVOLUTIONARY HISTORY AND BIOGEOGRAPHY
Bibliographic record
Abstract
The olenellinid trilobites of the Early Cambrian are a diverse clade that has been an ideal group used in phylogenetic analyses. Recently, new specimens from the Sekwi Formation of the Mackenzie Mountains, Northwest Territories, Canada, were collected to add more material, to help paleontologists to better understand this group. This thesis presents three new species of Bradyfallotaspis and one new species of Nevadia. Further, new specimens of Nevadia ovalis expand the known geographic range for this species, only known previously from a locality in Senora, Mexico. This expansion is unusual for olenellinid trilobites, which generally have very restricted ranges. A phylogenetic analysis of Judomia absita was performed to help ameliorate confusion regarding its generic assignment between Judomia and Paranevadella, providing further support for a close biogeographic relationship between Laurentia and Siberia.
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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 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".