Bibliographic record
Abstract
Ediacaran oceans hosted a strange world of exotic soft-bodied forms that were a failed early evolutionary experiment in macroscopic life. These enigmatic organisms appear suddenly in sedimentary rocks as old as 573 Ma above a glacial diamictite in Newfoundland, and, in most successions, a profound and equally puzzling negative carbon cycle anomaly known as the Shuram excursion. The Ediacaran biota died out near the Ediacaran-Cambrian boundary (<541 Ma) coincident with a second strong negative δ13C excursion. From Ediacaran ashes, the proliferation of complex feeding traces, soft-bodied arthropod tracks, and mineralized skeletons in the succeeding Fortunian stage led to a diverse landscape of modern phyla by the detonation of the Cambrian explosion around 529 Ma. This chapter provides a review of the profound changes in the carbon, sulfur, and strontium cycles across this critical transition in order to better understand the redox history of the oceans, as well as the tectonic, climatic, and biological events preserved in its sedimentary archive, and further proposes a novel resource-based hypothesis for the rise and fall of the Ediacaran biota.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.013 | 0.002 |
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".