Bibliographic record
Abstract
Summary The Pangean supercontinent extended and broke apart in the early Jurassic, but an understanding of how and why this event took place when it did has remained elusive. An analysis of the angular velocities governing the global plate circulation during this period reveals that the final closure of the Paleo-Tethys Ocean between Eurasia and Cimmeria and the early opening of the Atlantic Ocean between North America and South America/Africa were governed by symmetric motions sharing a common rotation axis. This symmetry is remarkable and is consistent with a subduction-driven mechanism in the disaggregation of Pangea. A basic hypothesis is that the Eurasia-Cimmeria collision disrupted the clockwise spin of Pangea during the Triassic. Pangea rifted because tensional stresses were redistributed within Pangea following the collision. Rifting was localized across zones of pre-existing thick-skinned weakness within Pangea (late Paleozoic suture zones) which were optimally-oriented parallel to the north Tethyan subduction system.
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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 | 0.002 |
| 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 | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".