The mid Cambrian (Guzhangian; Marjuman) trilobite genus 'Catillicephala' Raymond 1938 (Catillicephalidae) from the Cow Head Group and correlatives in eastern Canada
Bibliographic record
Abstract
Species of 'Catillicephala' Raymond, 1938 from eastern Canada are revised from restudy of types, including a number of previously unfigured specimens, from the Grosses-Roches Formation, Quebec, and undescribed material from the Shallow Bay Formation (Cow Head Group), western Newfoundland. In both regions, sclerites are from allochthonous, shelf-derived limestone boulders in deep water, debris flow conglomerates. Several species founded upon inadequate material from Vermont are considered to be nomina dubia, including the type species, 'C. ovoides' (Raymond), 'C. lata' (Raymond) and 'C. fowleri' Shaw; new species from eastern Canada are 'C. calva' and 'C. shawi'. Catillicephala impressa (Rasetti) occurs in both Quebec and Newfoundland, 'C. rotunda' (Rasetti) and 'C. calva' are known only from Quebec, whereas 'C. shawi' is from Newfoundland. From faunal associations in the Grosses-Roches - Metis-sur-Mer region of Quebec, and the Cow Head area of western Newfoundland, 'C. impressa', 'C. lata', and 'C. shawi' are approximately the same age and occur in boulders that correlate with the late Marjuman (Guzhangian) 'Crepicephalus' Zone of Laurentian North America. Catillicephala rotunda appears to be older than the other species, and likely occurs in boulders that correlate with the 'Cedaria' Zone.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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".