The palynostratigraphy, age, and environment of strata penetrated by the Mallik 5L-38 gas-hydrate research well, Northwest Territories, determined by differentiating the recycled and contemporaneous palynomorphs
Bibliographic record
Abstract
Quantitative palynostratigraphy of the Mallik 5L-38 well provides insight into palynomorph recycling and a Late Eocene age for the basal coals. Samples from 450 m to 900 m yielded a fraction on the 180 ?m screen having a high concentration of recycled palynomorphs, releasable by standard oxidation. The fraction that passed through the screen was not oxidized and yielded more in-place palynomorphs. This observation may affect interpretation of other regional upper Cenozoic studies of oxidized samples. The 0-270 m interval is interpreted to be late Pliocene to Pleistocene. The regional erosional unconformity below the Iperk Sequence is identified at 340 m, with other possible unconformities at 445 m and 550 m. The interval from 340 m to 700 m is thought to be Early Miocene. The 700-900 m interval is tentatively identified as Oligocene. Climate proxy ratios, compared with those of Mallik 2L-38 well between 670 m and 900 m are inconsistent, possibly due to low palynomorph counts or a change from a coherent Late Eocene record to a noisy Oligocene and younger record. An erosional unconformity near 930 m may have resulted from sea-level decline due to earliest Oligocene glaciation in Antarctica. Core samples from coal beds between 933.65 m and 1081.90 m yielded Late Eocene palynomorphs unlikely to be recycled, and some pollen associated with earlier Eocene ages. The coal swamps seem to be an environment where relict species can persist. A warm paleoclimate is indicated, consistent with an Eocene age.
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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 | 0.000 | 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) | 0.001 | 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".