Tubular Tidalites: A Biogenic Sedimentary Structure Indicative of Tidally Influenced Sedimentation
Bibliographic record
Abstract
Abstract: The most conclusive evidence of tidal sedimentation consists of deposits that exhibit evidence of rhythmic sedimentation attributable to tidal cyclicity. Until now such deposits have been limited to physical sedimentary structures. Tubular tidalites, defined herein, are combined biogenic–physical sedimentary structures that provide compelling evidence for tidal mediation in sedimentary successions. These structures consist of rhythmically bedded alternating layers of fine-grained and coarse-grained laminae deposited within open framework burrows such as Arenicolites, Ophiomorpha, Palaeophycus, Psilonichnus, and Thalassinoides. Importantly, the open framework burrows represent natural sediment traps that potentially preserve depositional cycles that might be missing due to high levels of bioturbation in settings such as intertidal flats and lagoons. The interpretation of the burrow infills as being tidally modulated is tested and supported in three ways: using exponential smoothing of thickness data on burrow-infilling laminae to identify rhythmic trends in laminae thicknesses, visually fitting sinusoidal curves to the raw thickness distributions, and using Fast Fourier Transform analysis. Considering the morphology of tubular tidalites presented, the parameters that promote the occurrence of tubular tidalites include an open aperture, bimodal sediment availability, tidal influence in sedimentation, and low overall sedimentation rates. Tubular tidalites have been identified from tidally influenced successions in Mesozoic, Cenozoic, and modern deposits and provide evidence of tidal influence in sedimentary successions where other indicators may be ambiguous.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 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".