Ovummuridae (calcareous microfossils) from a Late Devonian ramp: their distribution, preservation potential, and paleoecological significance
Bibliographic record
Abstract
Enigmatic calcareous microfossils that belong to the Ovummuridae Munnecke, Servais, and Vachard, 2000 are present in ten cores through the upper part of the Escarpment Formation and Alexandra Formation in the Hay River area of the Northwest Territories, Canada. These Late Devonian (Frasnian) siliciclastic, mixed carbonatesiliciclastic, and carbonate ramp deposits accumulated on the western margin of Laurussia. Finding ovummurids in these deposits is significant because it provides the first formal documentation that these microorganisms existed in the Devonian and confirms that the stratigraphic range of the family extends from the Lower Silurian to Upper Permian. The microfossils, which are of unknown biological affinity, include Minourella gotlandica, previously known only from Silurian strata, Ovummurus duoportius, and Minourella cameroni sp. nov. The preservation potential of these microfossils was markedly enhanced by thick cement overgrowths, akin to the syntaxial overgrowths that are common on Paleozoic crinoid fragments. The distribution of ovummurids in these ramp deposits is significant because it demonstrates that ovummurids were capable of inhabiting turbid, likely nutrient-enriched marine environments, with significant siliciclastic influx, that were unsuitable for most other carbonate-secreting organisms in the Paleozoic.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| 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".