Triassic conodonts and their role in stage boundary definition
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Abstract Conodonts have played an important role in the construction of a Triassic timescale. Each of the stage boundaries is reviewed in the context of their evolving conodont faunas. The base Triassic (Induan) is defined by the appearance of Hindeodus parvus , which developed from H. praeparvus ; a parallel zonation is provided by Neogondolella species. For the Induan–Olenekian boundary, the appearance of Neospathodus waageni sensu lato within a plexus of similar species is favoured as the defining datum; Borinella and Eurygnathodus also appear about this time. The base of the Middle Triassic Anisian stage lies close to the appearance of Chiosella , with Triassospathodus and Spathicuspus characterizing the late Olenekian, and Gladigondolella tethydis and Nicoraella confined to the Anisian. Proxies for the Anisian–Ladinian boundary, which is defined by an ammonoid, are the first Budurovignathus species. The basal Carnian, also defined by an ammonoid, lies close to the first metapolygnathids, including M. polygnathiformis and M. tadpole . The Carnian–Norian boundary interval is characterized by many new taxa in Canada, but only a few species are common to Tethys, notably Metapolygnathus ex gr. M. echinatus . The Norian–Rhaetian boundary is likely to be based on evolution in Misikella in Tethys, with concurrent changes recognized in North American Epigondolella .
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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 it