Devonian Sandstones from the Lievin Shaft n° 8, Avion (Pas-de-Calais, France) : Historical Context and Additional Vertebrate Remains
Bibliographic record
Abstract
The Liévin shaft n° 8 of the Nord – Pas-de-Calais coal basin worked as a ventilation shaft from 1948 to 1982. Collections of Early Devonian vertebrates, made both in situ during boring of the shaft, and later on its slag heap, included mostly pteraspidid heterostracans, plus a few remains of cyathaspidiforms, osteostracans, as well as thelodont and acanthodian scales. In 1982, vertebrates were collected on its slag heap. They came from the subsurface Lochkovian, lower Pernes Formation. They include Heterostraci (Traquairaspididae indet., Rhinopteraspis crouchi, Pteraspididae indet.), Osteostraci (Cephalaspis sp.) and ‘actinolepid’ Arthrodira (Kujdanowiaspis? sp.). These are dated of the R. crouchi Biozone, and correlated to the ‘middle’ Lochkovian. As in the Liévin shaft n° 6, it corresponds to the highest diversity for the latest Silurian-Early Devonian sequence of vertebrates in Artois (northern France). This peak is known worldwide.
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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 | 0.004 | 0.002 |
| Science and technology studies | 0.001 | 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) | 0.003 | 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".