Descriptions of Paleozoic cores and thin sections from the Gudrid H-55, Roberval K-92, Indian Harbour M-52, and Freydis B-87 wells, offshore Labrador (Newfoundland and Labrador)
Bibliographic record
Abstract
The Paleozoic of offshore Labrador has received minimal attention due to its limited geographic extent and the lack of reliable biostratigraphic data, preventing correlation of these strata on a regional to global scale. Paleozoic strata are encountered in seven wells in the Hopedale Basin, of which, only four wells have cores associated with the pre-Mesozoic interval (Gudrid H-55, Roberval K-92, Indian Harbour M-52, and Freydis B-87). Six cores from the four wells, along with their associated 43 thin sections, are described here in an attempt to document lithological similarities between the wells that might provide insight into the timing and depositional environments of these rocks. Five of the six cores are composed of carbonate rocks with compositions ranging from dolostone (Gudrid H-55, Roberval K-92), to limestone and dolostone (Indian Harbour M-52), to primarily limestone with minimal diagenetic alteration (Freydis B-87 Core #2). Fossil material is rare to absent in pervasively dolomitized cores. Small, taxonomically indeterminate fossil fragments are common in the cores from Indian Harbour M-52 and Freydis B-87, along with shell fragments, articulated bivalve and brachiopod shells, echinoderms (crinoids), gastropods, sponge spicules, bryozoans, dasycladacean green algae, trilobites, ostracods, and calcimicrobes (Girvanella). Core #1 from the Freydis B-87 well, the only siliciclastic Paleozoic core, is composed of sandstones, siltstones, and mudstones. Roberval K-92 Core #6 contains two, mafic igneous intervals and hydrocarbon-charged porosity is observed in both cores from this well. Correlation of these Paleozoic strata, although consistent with similarities in the quantity and nature of fossil content, must await rigorous biostratigraphic assessment.
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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 | 0.003 | 0.004 |
| 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) | 0.004 | 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".