North American Spathian (upper Olenekian, Lower Triassic) neogondolellin conodonts
Bibliographic record
Abstract
Abstract The taxonomy and biostratigraphy of poorly known neogondolellin conodonts from mostly Spathian (upper Olenekian, Lower Triassic) strata are described from widespread localities in North America: high latitude Canadian Arctic, mid‐latitude British Columbia (BC), and lower latitudes in the USA. The occurrence of the neogondolellins in key sections and in matrix of dated ammonoid collections is documented. Neogondolellins characteristic of seven ammonoid zones are identified. Fifteen new conodont species are assigned to four genera:Borinella,Columbitella,MagnigondolellaandNeogondolella.Borinella, more common in the Smithian, undergoes a radiation in the early Spathian ‘tirolitid n. gen. A’ ammonoid beds of California eventually resulting in five newNeogondolellaspecies (Ng. bucheri,Ng. darwinensis,Ng. praeacuta,Ng. sinuosa, and laterNg. spathiconstricta) and the first newMagnigondolella,Mg. mutata. Several of these plusBo.? curvatasp. nov. also occur above thetardusZone in British Columbia (BC). In the next younger ammonoid zone withTirolites, the firstColumbitellaareCb. joanaeandCb. weitschati. Middle SpathianColumbitesandProcolumbitesammonoid beds in the USA are dominated byCb. elongata, whereas the broadly equivalent strata in the north containCb. amica,Cb. brevissp. nov. andCb. paragondolellaeformis. Late Spathian radiation produces six new species ofMagnigondolella:Mg. incurva,Mg.?minutaandMg. trutchensisin theProhungaritesammonoid beds, followed byMg. acuminata,Mg. tozeriandMg. peribolain thehaugiandsubrobustusammonoid zones.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 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) | 0.002 | 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".