New material of<i>Procolophon</i>(Parareptilia: Procolophonoidea) from the Lower Triassic of Brazil, with remarks on the ages of the Sanga do Cabral and Buena Vista formations of South America
Bibliographic record
Abstract
We describe a large, fragmentary procolophonid skull and three large vertebrae from the Sanga do Cabral Formation, Paraná Basin, Lower Triassic of Brazil. Cranial and dental morphology allow us to refer the skull to the genus Procolophon; the fragmentary nature of the specimen, however, does not permit identification to species. The vertebrae are tentatively assigned to Procolophon. They are of a size expected for an individual represented by the skull, although the cranial and postcranial elements were not directly associated. The vertebrae are unusual for a procolophonid in exhibiting neural arches that are twice as broad as they are long, a dimension seen elsewhere among parareptiles only in pareiasaurs. A comparison of the manner of tetrapod preservation between the Sanga do Cabral and Katberg formations reveals that tetrapods in the former occur within conglomerates, whereas in the latter they are recovered mainly from mudstones. This taphonomic disparity may account for the absence in South America of the nearly cosmopolitan synapsid Lystrosaurus. The recent recognition of Permian tetrapods from the Buena Vista Formation of Uruguay, regarded widely to be a lateral equivalent of the Sanga do Cabral Formation, is assessed. We conclude that there is no compelling evidence of Permian tetrapods from the Buena Vista Formation and that the available information is suggestive of an Early Triassic age for that formation.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 0.002 |
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".