The Possible Largest Impact Crater in the World: A Case of Central North China
Bibliographic record
Abstract
Large meteorites pose a threat to lives and would change the course of life evolution on Earth. The three proven large meteorite craters in the world are Vredefort in South Africa, Sudbury in Canada, and Chicxulub in Mexico. This article analyzes some evidence of finding in the northern part of Ordos to propose a possible larger crater than the above. A 325-km long arc-shaped Langshan uplift, a 15 km-deep trench, chaotic strata and numerous thrust layers in the Langshan, abnormal orientation of crystalline basement structures in the north of Ordos, Moho uplift, and meteorite fragments presented in the northern part of the Ordos Basin. All phenomena support a possible meteorite hit event that happened in the northern part of the Ordos Basin during the Late Cretaceous period. The impact pushed the block of the north of Ordos Basin northwestward, subduction after colliding with C~P granitoid in the north and forming the trench.
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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 | 0.003 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".