Palynological analyses of the two Labrador Shelf wells, Petro-Canada et al. Corte Real P-85 and Petro-Canada et al. Pothurst P-19, offshore Newfoundland and Labrador
Bibliographic record
Abstract
Both the Saglek and Hopedale sedimentary basins, respectively located on the northern and southern offshore Labrador margins, attracted hydrocarbon exploration in the 1970s and early 1980s. Two significant wells were Corte Real P-85 in the Hopedale Basin and Pothurst P-19 in the Saglek Basin. To determine the ages and paleoenvironments of the sediments in these wells, I undertook analyses of the organic-walled microfossils (dinocysts, miospores, acritarchs, chitinozoa), which are collectively termed palynomorphs. Both wells encountered only Tertiary sediments, with Corte Real P-85 being in the Ypresian at total depth and Pothurst P-19 being in the Lutetian at total depth. In both wells I identified a thick Lutetian section, an unusual occurrence in Labrador Shelf wells. One pleasant surprise was the flood of small pollen grains in the Plio-Pleistocene of Corte Real P-85, which holds promise for subdividing this time interval in Labrador Shelf wells. Reworking trends occur in both wells, with Carboniferous spores and Cretaceous spores and dinocysts common in Corte Real P-85, whereas in Pothurst P-19 only Cretaceous palynomorphs are reworked. Presumably the specimens were transported from the west and northwest. Significant breaks in the section are the apparent absence of Bartonian and Middle Miocene and the attenuated Priabonian sediments in Pothurst P-19. Neither well discovered oil nor natural gas.
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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 | 0.002 |
| 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) | 0.002 | 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".