Scale microfossils from the mid-Neoproterozoic Fifteenmile Group, Yukon Territory
Bibliographic record
Abstract
Microscopic phosphatic scales are found in limestones and cherts from the 812–717 million year old Fifteenmile Group of the Yukon Territory. These enigmatic microfossils, which to date have not been identified in any other locality, display a diversity of intricate morphologies. Here we describe six new genera containing 17 new species of scale microfossils obtained from macerated limestone. We also revise existing taxa described originally from chert thin sections and now additionally freed from limestone by acid dissolution. New taxa described here are:Archaeoxybaphon serratacapacisn. sp.,Archeoxybaphon serratapusillan. sp.,Paleoscutula inornatan. gen. n. sp.,Paleoscutula serratan. gen. n. sp.,Paleoscutula convocationisn. gen n. sp.,Hexacatillus allmoniin. gen. n. sp.,Hexacatillus retetantillusn. sp.,Quadrireticulum allisoniaen. gen. n. sp.,Quadrireticulum palmaspinosumn. gen. n. sp.,Circidentatus pistricisn. gen. n. sp.,Circidentatus variodentatusn. gen. n. sp.,Ospercapatera awramikiin. gen. n. sp.,Circitorquis soccusn. gen. n. sp.,Paleohexadictyon alexandraen. sp.,Paleomegasquama arctoan. sp.,Petasisquama petasusn. sp., andThorakidictyon circireticulumn. gen. n. sp. Taxa described or amended here areCharacodictyon skolopiumAllison and Hilgert, 1986,Paleohexadictyon myriotrematumAllison and Hilgert, 1986,Archeoxybaphon polykeramoides(Allison and Hilgert, 1986) emend.,Paleohexadictyon litosum(Allison and Hilgert, 1986) emend., andThorakidictyon myriocanthum(Allison and Hilgert, 1986) n. comb. Many eukaryotic clades include species with surficial scales but none provides a close morphological analog to the Fifteenmile scales. Nonetheless, comparative and functional morphology suggest that the diversification of heavily armored and morphologically complex cell-coverings records a changing ecological landscape in Neoproterozoic seas.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 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".