Taphonomy, Depositional Environments, and Biotic Comparisons of the Silurian Eramosa Lagerstätte, Ontario, Canada
Bibliographic record
Abstract
The Silurian Period represents the first major terrestrial colonization by multicellular life, and evidence of this transition is preserved in shallow-marine environments. Comprehensive analyses of biodiversity in the fossil record are dependent on the preservation of soft-bodied taxa in Konservat-Lagerstätten, as the fossil record is biased towards preservation of mineralizedremains. The Silurian Eramosa Formation of Ontario, Canada (Wenlock Series, Sheinwoodian Stage; 432.9-430.6 Mya) preserves diverse assemblages in multiple localities that represent a range of depositional environments from marginal marine to fully marine, thus presents a unique opportunity to analyze how preservation mode changes throughout a single carbonate Lagerstätte. In Chapter 1, I describe the sedimentology and stratigraphy of Park Head and Hepworth, two Eramosa Lagerstätte localities described more recently, and compare them to the type locality of the Lagerstätte at Wiarton, Ontario. I interpret a depth gradient of the Lagerstätte intervals, with Park Head in the south being the deepest, Wiarton in the north being the shallowest, and Hepworth as an intermediary. In Chapter 2, I describe the preservational pathways of the three distinct biotas of the Eramosa Lagerstätte, and identify taphonomic patterns related to taxonomy and depositional environment. In Chapter 3, I expand our view and for the first time compare the biota of the Eramosa Lagerstätte to 17 Silurian Lagerstätten worldwide. Using cluster analyses, I identify which Lagerstätten biotas are most similar to one another, and compare how varying statistical methodologies and data treatment affects interpretations. Reconstructing past ecosystems using Konservat-Lagerstätten depends on correctly identifying the taphonomic and environmental lenses inherent to their existence. The Eramosa Lagerstätte demonstrates the necessity and opportunity to study this critical time period in Earth history.
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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 | 0.004 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 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".