Paleoenvironmental analysis of Ediacaran strata in the Catalina Dome, Bonavista Peninsula, Newfoundland
Bibliographic record
Abstract
Ediacaran strata in the Conception and St. John's groups that are exposed in the Catalina Dome, eastern Newfoundland, comprise a succession that is thinner but otherwise broadly similar to that known from the well-studied outcrops near Mistaken Point in southern Avalon Peninsula and Spaniard's Bay in northern Avalon. In all of these areas, strata consist of turbidites deposited in deep-water basin-plain and slope environments, but important differences help to constrain interpretations of basin history and Ediacaran paleobiology of eastern Newfoundland. A turbidite paleocurrent shift from easterly to southerly is consistent with the existing two-phase tectonic model for basin evolution previously proposed for the Avalon Peninsula. In the Catalina Dome, however, this shift occurred stratigraphically higher than at Mistaken Point but lower than at Spaniards Bay in the Avalon Peninsula. Probable seismoturbidites are common in the lower part of the Catalina succession, suggesting particularly active tectonism. Except in the very lowest 20 m of the succession (Drook and lowermost Mistaken Point formations) in which ash is absent, volcanic ash beds are both more common and more volumetrically significant throughout the succession than farther to the south and east, which suggests that deposition occurred closer to the volcanic arc. Volcanic ash beds persist higher stratigraphically, occurring within the Fermeuse Formation, which here contains diverse rangeomorph fossils in contrast with the low-diversity assemblage of Ediacaran discs prevalent in the Fermeuse Formation of the Avalon Peninsula. This distribution strongly reaffirms the importance of taphonomy in controlling the composition of deep-water Ediacaran assemblages.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".