Abstract: Stratigraphic analysis and possible tidal influence in the Stellarton Basin, Nova Scotia
Bibliographic record
Abstract
The Late Carboniferous Stellarton Basin, located in central Nova Scotia, formed as a pull-apart basin resulting from dextral movement on the Cobequid and Hollow faults. These bound the basin tq the north and south, respectively. The 6 km by 8 km basin contains the approximately 2600 m of strata of the Stellarton Fonnation. The upper portion of the Stellarton Formation was deposited during the Westphalian CID and is composed of the Coal Brook Member and the overlying Thorburn Member. Two oil shale-bounded intervals from the upper Stellarton Formation were studied in order to observe a full spectrum of lithological facies in the area. An interval from the Coal Brook Member bounded by oil shales 21 and 22 exhibits a lateral thickness variation of 20 m to 1 0 m from east to west. The interval represents a distal facies association consisting of oil shale grading into mudstones (both laminated and massive), and a fine-grained sandstone element, which decreases in proportion with interval thickness. An interval from the Thorburn Member between oil shales 7 and 8 displays an increased proximal component to the facies association. This approximately 60-metre interval includes oil shales, mudstones, and fine-grained sandstones as well as coarsergrained sandstones, rooted paleosol horizons, and thin coals. Both intervals show flaser and lenticular bedding associated with small-scale cross-bedding as well as localized bWTowing. The spectrum of facies observed suggest river-fed deltas advancing into standing-water bodies with low-energy hydrodynamic conditions. The Stellarton Formation has traditionally been interpreted as lacustrine in origin. ,However, research is ongoing into the possibility of tidal influence in the Stellarton Basin. Paired mud drapes have been discovered in laminated mudstones and sandstones of the studied intervals. Although the lack of marine fossils and the low-sulphur coals of the area argue against marine influence, paired mud drapes are considered characteristic of tidally affected environments. Further study of the abundance and distribution of the paired mud drapes within the studied intervals is underway. Marine influence has been documented in the coeval Malagash Formation nmth of the Cobequid and Hollow faults, and incursions could have generated periodic restricted marine conditions in the Stellarton Basin.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.001 | 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".