Abstract: Results of a ground magnetic survey over the Bloody Creek impact structure, Bridgetown, Nova Scotia
Bibliographic record
Abstract
This study investigates the total magnetic field strength over the Bloody Creek impact structure, located approximately 10 km south of Bridgetown, Nova Scotia. This 400 m-diameter, slightly elliptical impact structure has been flooded by Nova Scotia Power’s Bloody Creek hydroelectric reservoir, and thus is not directly available for study. Consequently, a ground magnetic survey was conducted over the site in the winter, when the reservoir was frozen. Measurements were standardized using a base station magnetometer, and a data quality assessment revealed that the data are highly reproducible. Results were evaluated using classical geostatistics, and a semivariogram was examined to understand the spatial variance structure. An isotropic spherical function with a small nugget effect was chosen as the appropriate model for subsequent kriging. A range of 38 m, nugget effect of 0.4 gamma2, and sill of 75.8 gamma2 were defined by this model. Before kriging, data were de-clustered at a scale approximating the sampling interval to ensure numerical stability in the kriging calculations. Ordinary kriging was undertaken, and an unbiased, minimum error variance surface describing the total magnetic field strength anomalies in the area was obtained. This surface was subjected to a number of empirical image analysis procedures to enhance any magnetic patterns that occur in the Bloody Creek area, including firstand second-derivative, and edge-detection maps. Interpretations of these surfaces reveal very subtle patterns that equivocally identify an elliptical crater structure. The obscure patterns suggest that the impact crater likely does not contain significant amounts of magnetic material (e.g., iron or chondrite meteor debris), and that impact did not substan-
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 teacher head, 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".