Biostratigraphy and taxonomy of polymerid trilobites of the Manuels River Formation (Drumian, middle Cambrian), Newfoundland, Canada
Bibliographic record
Abstract
This dataset contains the digitized treatments in Plazi based on the original journal article Unger, Tanja, Hildenbrand, Anne, Stinnesbeck, Wolfgang, Austermann, Gregor (2022): Biostratigraphy and taxonomy of polymerid trilobites of the Manuels River Formation (Drumian, middle Cambrian), Newfoundland, Canada. Geodiversitas 44 (33): 1051-1087, DOI: 10.5252/geodiversitas2022v44a33ABSTRACTNewfoundland’s middle Cambrian fine-clastic Manuels River Formation is renowned for its wellpreserved trilobite fauna. Here we present a newly collected assemblage of 1184 specimens from the type locality at Conception Bay South, Newfoundland, Canada. The faunal assemblage comprises detailed information about the accurate ranges of each species. Thus, the polymerid Paradoxides davidis and Paradoxides hicksi zones previously established for the region and the globally recognised agnostid Tomagnostus fissus, Hypagnostus parvifrons, Ptychagnostus atavus, and Ptychagnostus punctuosus zones are now precisely correlated. The polymerid fauna is comparable with that of other regions of Avalonia, Baltica, and partly with Gondwana. Our analysis of the faunal assemblage demonstrates that there is a need for comprehensive revisions of Cambrian trilobite faunas, including important and well-known taxa such as Agraulos Hawle & Corda, 1847, and Paradoxides sensu lato. Sao hirsuta Barrande, 1846, was earlier documented from the Czech Republic, Spain and Germany, and is now first described from western Avalonia, while Bailiella aequalis (Linnarsson, 1882) was already mentioned for eastern Newfoundland and is now illustrated for the first time. The specimens presented here were assigned to the orders Ptychopariida, Redlichiida and Corynexochida and include Agraulos ceticephalus (Barrande, 1846); Jincella? applanata (Hicks in Salter & Hicks, 1869); Sao hirsuta Barrande, 1846; Bailiella aequalis (Linnarsson, 1882); Bailiella tenuicinta (Linnarsson, 1879); Meneviella venulosa (Hicks, 1872); Paradoxides davidis Salter, 1863; Plutonides hicksii (Salter, 1866b); Clarella venusta (Billings, 1872); and Acontheus inarmatus Hutchinson, 1962.MOTS CLÉSMiaolingien,Cambrien,Canada,Avalonia,trilobites polymères,biostratigraphie,synonymes nouveaux.
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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 | 0.005 | 0.007 |
| Science and technology studies | 0.001 | 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) | 0.005 | 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".