Triassic echinoids (Echinodermata) from the Aksala Formation, north Lake Laberge, Yukon Territory, Canada
Bibliographic record
Abstract
Abstract Late Triassic (Carnian–Norian) echinoids from the Aksala Formation in the Lake Laberge area of the Whitehorse Trough, Yukon Territory, Canada, are described. These echinoids comprise the first description of Triassic echinoids from Canada and, with the exception of fragmentary material from Utah, are the only Upper Triassic echinoids on the western coast of Pangaea north of Peru.Triassicidaris peruviensisSmith is identified from a coronal fragment that consists of an ambulacral column and five attached interambulacral plates from a Carnian outcrop succession.Parvicidarissp., also from Carnian strata, is identified based on a coronal fragment that consists of two ambulacral and three interambulacral columns. This occurrence extends the range of this typically Norian taxon both north to the Yukon and earlier into the Carnian. Additional specimens, identified asTriassicidarissp., occur within Norian strata of the Aksala taxa, one of which (‘Cidaris’labergensissp. nov.) is new. Both the corona‐based taxa and the spine form taxa show mixed affinities with Tethyan and southern New World populations and reinforce the association between Triassic echinoid faunas and reefal settings.
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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".