Escape traces associated with <i>Rafinesquina alternata</i> , an Upper Ordovician strophomenid brachiopod from the Cincinnati Arch Region
Bibliographic record
Abstract
Abstract Strophomenid brachiopods of the genus Rafinesquina, lying flat, convex-side up on limestone bedding surfaces in the Cincinnati Ordovician, are sometimes associated with moats, which are sediment depressions or gutters ∼5-mm wide surrounding the commissure. Moats are interpreted as trace fossils, excavated by water expelled as the valves snapped shut. Other specimens vary from nearly horizontal to nearly vertical with the hinge line down and commissure up. Meniscate backfill beneath the anterior shell margin traces an arcing path formed as the shell rotated upwards around the posterior hinge line. Rotational tracks are interpreted as trace fossils, recording movement from an initial position buried horizontally to an inclined position as the brachiopod tried to escape burial. The traces form a continuum. Specimens lying flat on the bed surface have moats but no rotational tracks. Inclined shells are associated with deeper burial by obrution events and a greater arc of rotation. The moat shape is inconsistent with differential compaction. The precise association between moats and commissures and the independence of these structures on shell azimuth are inconsistent with current scour. If moats formed by rapid expulsion of water during valve snapping, then rotational tracks may have formed by a similar process. These traces are interpreted as fugichnia formed in response to catastrophic burial, but some moats could be equilibrichnia, formed by adjustment to minor sedimentary events. Rotational traces are similar to type 1 structures of Sowerbyella. If these two genera had similar tracemaking abilities, then other strophomenates probably shared these abilities.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".