Trilobite Taphonomy of a Silurian Reef: Attawapiskat Formation,
Bibliographic record
Abstract
Trilobites of exhumed reefs of the Late Llandoverian Atta-wapiskat Formation of northern Ontario occur in accumu-lations that have undergone extensive taphonomic sorting. Most spectacular are monospecific to low-diversity ‘‘pockets’’ of the large scutelluine Ekwanoscutellum. These accumu-lations, which cover areas of up to a square meter, are nest-ed stacks of mostly inverted (concave-up) large sclerites, the majority of which are pygidia. They may have formed by passive settling of sclerites in ‘‘current-shadows’ ’ in the lee of obstacles in the reef system. Excellent preservation of the sclerites, absence of epibionts, and minimal internal sedi-ment with in the ‘‘pockets’ ’ suggest rapid accumulation. Ag-gregation of individuals for molting and reproduction may explain the availability of large numbers of Ekwanoscutel-lum sclerites as raw material for the accumulations. A sec-ond, less common assemblage is a more diverse association dominated by the scutelluine Meroperix and the illaenid Stenopareia, and is often associated with abundant calcia-te brachiopods. Although some sorting has taken place, more variable dorso-ventral orientations and lower sclerite abundances indicate a different origin from the Ekwanos-cutellum Association. The data underscore the taphonomic complexity of patchy environments such as Silurian reefs and indicate that extensive sorting of skeletons is a signifi-cant source of bias in the paleoecologic analysis of non-framework components of reef biofacies.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 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) | 0.003 | 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".