Microbial components and metamorphic grade of Miaolingian (Cambrian) black shales from the Burin Peninsula, Newfoundland, Canada
Bibliographic record
Abstract
The analysis of microbial and palynological remains in Cambrian shales is useful for biostratigraphic and palaeoecological purposes but, in outcrops affected by contact metamorphism, also for discriminating burial and metamorphic temperatures. The microbial composition of the Miaolingian black shales from the Pleasant View Formation (Inlet Group) in the Burin Peninsula consists of monospecific cyanobacterial associations of Bavlinella faveolata, a cosmopolitan taxon that characterized eutrophication episodes in Neoproterozoic to Miaolingian times. The specimens show varying degrees of degradation under thin-section (2D) and Field Emission Gun Scanning Electron Microscopy (FEGSEM, 3D). Raman Spectra of Carbonaceous Materials (RSCM) thermometry applied to both the acritarchs and meshworks of amorphous organic matter has reported average metamorphic temperatures of 300 to 343 ºC, whereas the standardized Crystallinity Index Standard value of 0.35 suggests temperatures slightly below the anchizone-epizone boundary, established at 300 ºC. The most likely fit for the peak metamorphic contact temperature recorded in Miaolingian black-shale samples, collected close to the Upper Devonian St. Lawrence granitic intrusions, is within the 300-350 ºC interval.
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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 | 0.000 |
| 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".