The Chicxulub impact crater and its influence on the regional hydrology in Northwestern Yucatan, Mexico
Bibliographic record
Abstract
In 1980 Luis Alvarez et al. proposed a revolutionary theory: the large mass extinction that occurred at the Cretaceous–Tertiary (K–T) limit (65 million years ago) was a consequence of the impact of a large bolide with Earth (Alvarez et al. 1980). This theory was considered highly controversial, particularly because it took over a decade to “discover” the crater. However, research about these phenomena on Earth became relevant only a couple of decades ago. The investigations on some important craters, such as Sudbury crater (e.g., Dressler and Sharpton 1999), Manson crater (e.g., Grieve 1989), Popigai crater (e.g., Masaitis et al. 1999), and Ries crater (e.g., Stöffler 1977; Hörz et al. 1983; Newsom et al. 1990; Von Engelhardt 1990), along with about 120 other craters discovered so far on the surface of Earth, proved that these events are not as rare as once thought. With the discovery of Alvarez et al. (1980) it was also proposed that these kinds of phenomena might have had a relevant, if not main, role in the evolution of life on Earth. In this chapter we present a brief summary of the importance of the Chicxulub impact crater, its discovery, and how it influences regional hydrogeology.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".