An unusual strophomenide brachiopod association in the Late Ordovician William Lake Lagerstätte, Williams Member of the Stony Mountain Formation (latest Katian), Manitoba
Bibliographic record
Abstract
The William Lake site within the Williams Member of the Stony Mountain Formation (Katian, Upper Ordovician) contains an unusual exceptionally preserved fossil fauna, including arthropods and cnidarian medusae. Several shells of the brachiopod that strongly resemble Holtedahlina paraprostrata Jin and Zhan, 2001 are described for the first time from this unit. Forty percent of the shells were found in an unusually close association with phosphatic tube-like fossils, perhaps indicating a symbiotic relationship, although there is not enough clear evidence to definitively determine the nature of this relationship. It was clearly advantageous to grow on or against skeletal material on a soft, muddy shallow marine seafloor, and both the brachiopod and the tube-like fossil may have benefited from the association at different times. Although other species of Holtedahlina have been found in a variety of depositional environments, Holtedahlina paraprostrata has thus far only been found in hypersaline or variable salinity settings, perhaps indicating an ability to tolerate unusual marine conditions, unlike most other rhynchonelliformean brachiopods that are typically stenohaline. Holtedahlina at the William Lake site, like other calcareous fossils, are rare and poorly preserved perhaps reflecting the unusual preservation at the site or representing a real ecological signal.
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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 | 0.002 | 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".