Stratal Architecture and Morphodynamics of Downstream-Migrating Fluvial Point Bars (Jurassic Scalby Formation, U.K.)
Bibliographic record
Abstract
Abstract: Assessments of depositional architecture and paleodrainage in planform are increasingly recognized as critical for the reconstruction of ancient fluvial morphodynamics; however, planview exposures of ancient, undeformed meandering-fluvial deposits are scattered, and exceptional occurrences such as the exhumed meander plain of the Scalby Formation (Yorkshire, UK) deserve particular attention. Here we specifically focus on the planview style and morphodynamics of downstream-migrating point bars, providing parallels with modern meandering rivers sharing scale and processes. The Middle Jurassic Scalby Formation lies in the Cleveland Basin of Yorkshire (UK), and accumulated in incised valleys eroded onto shallow-marine strata. Five well preserved downstream-migrating point bars are exposed along a modern tidal platform. Through 1:2000-scale mapping, point bars are analyzed for sedimentology, stratal architecture, vectors of paleoflow and bar migration, and nature of adjacent and underlying deposits. Results indicate that downstream migration was facilitated by—but not strictly related to—the occurrence of resistant outer banks. Meander-bend migration promoted cannibalization of upstream-bar portions, subordinate preservation of central-bar portions, and widespread development of downstream-bar scrolls. The most reliable indicators of regional transport are upstream-bar paleoflow indicators and the dip direction of downstream-bar inclined beds. The generated sectional architecture overlaps in part with that of other fluvial depositional models, such as those for braid bars, indicating that lack of planform exposures may introduce bias when reconstructing ancient fluvial morphodynamics.
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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 | 0.002 | 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 | 0.001 |
| Open science | 0.000 | 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".