Distribution and correlation of<i>Sabellidites cambriensis</i>(Annelida?) in the basal Cambrian on Baltica
Bibliographic record
Abstract
Abstract Sabellidites cambriensisis a tubular non-mineralized metazoan that appears as compressed ribbon-shaped imprints with transverse wrinkling, thick walls and an even tube diameter of up to 3 mm. The distribution ofSabelliditesis investigated in three Ediacaran–Cambrian sections on the Digermulen Peninsula in Arctic Norway, spanning the Manndrapselva Member of the Stáhpogieddi Formation and the lower member of the Breidvika Formation. Here, the Ediacaran–Cambrian boundary is located in the lower part of the upper parasequence (third cycle) of the Manndrapselva Member. Specimens ofSabelliditesare rare but consistently present close to the lowest level ofTreptichnus pedumand upsection, whereas the taxon is common and abundant in the lower part of the lower member of the Breidvika Formation, with an upper record atc.55 m above the base. The range is comparable with that of the GSSP section in Newfoundland, Canada, establishingSabelliditesas an index fossil for the lowermost Cambrian. In the Manndrapselva Member,Sabelliditesco-occurs with the acritarchGranomarginata, indicative of the lowermost CambrianGranomarginataZone, whereas in the Breidvika Formation it co-occurs withAsteridium.Sabelliditesis widely distributed in Baltica, through the Rovnian and Lontovan regional stages but confined to the Fortunian global stage. In its lower range,Sabelliditesis associated with aTreptichnus pedumtrace fossil association and a depauperate leiosphaerid acritarch assemblage, followed by aGranomarginataassemblage. In its upper range,Sabelliditesco-occurs with acritarchs of theAsteridium–ComasphaeridiumZone and the tubular foraminiferanPlatysolenites. In Baltica,Sabelliditesis a useful index fossil.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| 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".