Late Ediacaran occurrences of the organic-walled microfossils Granomarginata and flask-shaped Lagoenaforma collaris gen. et sp. nov.
Bibliographic record
Abstract
<jats:title>Abstract</jats:title> <jats:p>New occurrences of flask-shaped and envelope-bearing microfossils, including the predominantly Cambrian taxon <jats:italic>Granomarginata</jats:italic>, are reported from new localities, as well as from earlier in time (Ediacaran) than previously known. The stratigraphic range of <jats:italic>Granomarginata</jats:italic> extends into the Cambrian System, where it had a cosmopolitan distribution. This newly reported Ediacaran record includes areas from Norway (Baltica), Newfoundland (Avalonia) and Namibia (adjacent to the Kalahari Craton), and puts the oldest global occurrence of <jats:italic>Granomarginata</jats:italic> in the Indreelva Member (&lt; 563 Ma) of the Stáhpogieddi Formation on the Digermulen Peninsula, Arctic Norway. Although <jats:italic>Granomarginata</jats:italic> is rare within the assemblage, these new occurrences together with previously reported occurrences from India and Poland, suggest a potentially widespread palaeogeographic distribution of <jats:italic>Granomarginata</jats:italic> through the middle–late Ediacaran interval. A new flask-shaped microfossil <jats:italic>Lagoenaforma collaris</jats:italic> gen. et sp. nov. is also reported in horizons containing <jats:italic>Granomarginata</jats:italic> from the Stáhpogieddi Formation in Norway and the Dabis Formation in Namibia, and flask-shaped fossils are also found in the Gibbett Hill Formation in Newfoundland. The <jats:italic>Granomarginata</jats:italic>–<jats:italic>Lagoenaforma</jats:italic> association, in addition to a low-diversity organic-walled microfossil assemblage, occurs in the strata postdating the Shuram carbon isotope excursion, and may eventually be of use in terminal Ediacaran biostratigraphy. These older occurrences of <jats:italic>Granomarginata</jats:italic> add to a growing record of body fossil taxa spanning the Ediacaran–Cambrian boundary.</jats:p>
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".