Ichnological Studies on Tempestites
Bibliographic record
Abstract
Trace fossils are proving to be powerful tools for recognition and interpretation of event beds. Tempestites contain a mixed trace fossil assemblage that reflects fluctuations in energy levels. The two different ichnocoenoses reflect varying behavioral responses of the organisms colonizing two successive, individually distinct habitats. The resident or fair weather ichnocoenose can be considered representative of a stable benthic community, within which individual populations are at or near their carrying capacity. Periodic generation of the storm ichnocoenose, on the other hand, represents the flourishing of a community of opportunistic organisms in an unstable, high stress, physically controlled environment. The general succession, typical terrigenous tempestites represented by the tempestites in the Upper Cretaceous Cardium Fm. of Alberta , Canada , consists of (1)a fair weather resident trace fossil suite; (2) a sharp basal contact, with or without a basal lag; (3)parallel to subparallel laminations (reflecting hummocky or swaley cross stratification); (4)common escape structures; (5) the dwelling burrows of opportunistic organisms that colonize the unexploited storm unit; (6) gradational burrowed tops, representative of bioturbation resulting from subsequent burrowing by organisms from higher colonization levels; and (7) a fair weather resident trace fossil suite indicative of a return to quiescent conditions following abatement. Up to now, the ichnology in the carbonate tempestites has not been well studied and reported. The succession found in the Upper Cambrian Gushan Fm. from eastern North China Platform can be regarded as the typical carbonate tempestites . The succession includes the following parts (from bottom to top): (1) the trace fossils on the sole of the thin bedded limestone containing Phycodes, Thalassinoides, Palaeophycus and Planolites etc; (2) 1-2 cm thick muddy limestone or limestone with or without lamination; (3) the opportunistic trace fossils Diplocraterion, Arenicolites and Skolithos on the surface of the limestone; (4) the surface of the limestone covered by about 1 mm thick trilobite debris; (5)1-2 mm thick mudstone or shale.
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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 | 0.003 | 0.002 |
| Science and technology studies | 0.002 | 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 | 0.001 |
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".