EARLY ORDOVICIAN (ARENIG) GRAPTOLITES FROM THE UPPER ST. GEORGE GROUP, PORT AU PORT PENINSULA: PRESERVATION, CORRELATION, AND PALEO-ENVIRONMENTAL AND STRATIGRAPHIC IMPLICATIONS
Bibliographic record
Abstract
Locally abundant, exquisitely preserved graptolites belonging to Didymograptellus bifidus are preserved in shallowwater carbonate rocks of the upper part of the Lower Ordovician St. George Group in newly exposed roadside outcrops at the west end of Port au Port Peninsula, western Newfoundland. The fauna, which accompanies a diverse shelly assemblage, occurs within 20 m of the top of the Costa Bay Member, Catoche Formation. The graptolites preserved in both limestones and dolostones add to other graptolitic intervals at about the same stratigraphic level elsewhere in Newfoundland. This may support a shelf-wide marine incursion of Iapetan ocean waters onto the shelf at this time. However, the graptolites appear to mark the base of a transition from open-shelf sedimentation via a high energy, carbonate sand barrier, to restricted peritidal sedimentation across the Catoche and Aguathuna formations boundary and were probably concentrated at this interval by hydro dynamic and geochemical conditions seaward of the barrier. In addition, the open shelf to peritidal transition is younger in the south (D. bifidus zone) than in the north (P. fruticosus 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) | 0.000 | 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".