EARLY ORDOVICIAN CHITINOZOANS FROM THE HONGHUAYUANFORMATION AND LOWER PART OF MEITAN FORMATION INDATANGKOU OF CHENGKOU, CHONGQING
Bibliographic record
Abstract
Summary The Ordovician sequence is complete and well exposed at Datangkou of Chengkou County, Chongqing City. The investigation has been carried out on chitinozoans, together with the graptolites and conodonts, from the Honghuayuan Formation and the Yingpan Member of the Meitan Formation which represents the late Early Ordovician and early Middle Ordovician in the eastern Dabashan, belonging to the north Yangtze carbonate platform. For this study thirty-five chitinozoan samples were collected so that a stratigraphical control can be expected based on graptolite or conodont zones in this interval. Chitinozoans are lacking in eleven samples while in others are abundant but poorly diversified. A total of seventeen species, three new species (Conochitina datangkouensis sp. nov., C.wengxigouensis sp. nov., Rhabdochitina chenkouense sp. nov.) included, belonging to six genera have been described and figured. Among the key species recorded, the FAD of Lagenochitina esthonica, C. poumoti, C. brevis and ?Eremochitina brevis allow biostratigraphical correlation with graptolite zones of the same section and chitinozoan zones from Quebec, Bohemia, and south-eastern Europe. Yet, we must emphasize the absence of the typical Conochitina symmetrica which is unrecorded in the Honghuayuan Formation.
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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 | 0.003 |
| Science and technology studies | 0.002 | 0.000 |
| 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".