Sedimentary stasis in a Jurassic lagoonal delta system: the Lastres Formation of Asturias, northern Spain
Bibliographic record
Abstract
The Jurassic Lastres Formation hosts a suite of well exposed deltaic facies, rendering it an ideal case study to understand the record of sedimentary stasis and true substrates within this broad depositional setting. With novel sedimentological and ichnological field data combined with existing literature, we discuss how durations of sedimentary stasis differ throughout the stratigraphy, ranging from years to centuries on floodplains, to hours to days in interdistributary bays, to instants within distributary channels. The likelihood of true substrates from any given environment being observed in the rock record increases with the recurrence frequency of stasis and preservation potential of the strata, and depends on a sufficiently long colonization window for signatures to be imparted. Intermediate durations lead to the best conditions for preservation of true substrates, as a relatively high recurrence frequency lines up with a sufficiently long colonization window and preservation potential. However, short stasis durations can provide informative snapshots of short-timescale events, and long stasis durations can provide broader palaeoenvironmental context that cannot otherwise be inferred.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.000 | 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".