Palynostratigraphy and lithostratigraphy of Carboniferous Upper Codroy Group and Barachois Group, southwestern Newfoundland
Bibliographic record
Abstract
A new zone, the Reticulatisporites carnosus Assemblage Zone of late Pendleian to Arnsbergian age, is proposed for miospore assemblages in the Searston Formation of the Barachois Group and in unnamed coal-bearing strata in higher portions of the group. The beds containing the zone can be correlated with those in other parts of the Euramerican floral province in western Europe (including the North Sea), where the climate was semi-humid. Temporal relationships suggested by these new biostratigraphic data indicate that a reassessment of the regional lithostratigraphy of southwestern Newfoundland is required. The Overfall Brook Member of the Robinsons River Formation, formerly assigned with its correlative, the Brow Pond Lentil, to the Codroy Group, is here identified as a basal unit of the Searston Formation. It lies unconformably on Codroy Group beds of Brigantian age. Elsewhere, the basal beds of the Barachois Group lie unconformably on pre-Carboniferous rocks. The Barachois Group in the Codroy and St. George’s Bay lowlands correlates with the Humber Falls and Howley formations of the Deer Lake Subbasin of western Newfoundland and with the Pomquet Formation of the Mabou Group, Nova Scotia. The Pendleian–Arnsbergian coal-bearing strata high in the undivided Barachois Group predate the post-Arnsbergian major floral crisis and, with their correlatives, represent the youngest known rock units of Mississippian age in Atlantic Canada. They are significantly older than the Pennsylvanian coal measures of Moscovian (Bolsovian) age in a small outlier near Stephenville, and we recommend the latter be removed from the Barachois Group.
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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 | 0.001 |
| 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 | 0.000 |
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".