Sedimentology and ichnology of a shallow-marine clastic system from the Silurian-Devonian Furada Formation of Asturias, Spain: Benthic response to event deposition and environmental disturbance
Bibliographic record
Abstract
The Furada Formation of Asturias, Spain, represents a clastic, wave-dominated shallow-marine unit deposited during the middle Silurian to the Early Devonian. This formation contains abundant evidence of event deposition and non-uniform distribution of bioturbation structures representing a benthic response to multiple stressors. The 170 m-thick succession was measured and described, and the ichnotaxa were recorded and associated with lithofacies. Most shallow-marine environments are characterized by periodic events of environmental disturbance, mainly by episodic deposition, which may be recorded by a change in both the degree of bioturbation and \nichnodiversity. The general depositional setting for this formation has been previously interpreted as a wave-dominated and storm-influenced shallow-marine environment. However, \nsedimentologic features described in this study such as anomalous heterolithic units and fluid mud flow deposits suggest the influence of fluvial discharge, making it a more complex depositional setting. Body fossils are restricted to a single subfacies and include disarticulated and fragmented echinoderms, brachiopods and bryozoans. The trace-fossil assemblages of this formation reflect environmental stress factors introduced by fluvial input (e.g., sedimentation rate, hydrodynamic energy, substrate consolidation), resulting in reduced ichnodiversity and low abundance. The overall trace-fossil content of the Furada Formation is generally representative of the Cruziana Ichnofacies. Integration of sedimentologic and ichnologic datasets allows for a refined depositional interpretation of the formation and greater understanding of the environmental diversity of wave-dominated shallow marine clastic systems, including middle Paleozoic shallow-marine benthos and their responses to event sedimentation and environmental disturbance.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".