Foraminíferos bentónicos en el barremiano inferior de la formación paja (boyacá-santander, colombia): evidencias preliminares de un posible bioevento
Bibliographic record
Abstract
El estudio preliminar de una serie de afloramientos del Cretácico inferior en los sectores deVilla de Leyva, y Vélez-Chipatá (Boyacá-Santander, Colombia) permitió la identificación de unaproporción elevada del foraminífero bentónico calcáreo Epistomina caracolla (ROEMER), en nivelesde composición bioesparítica para la parte media de la Formación Paja. Los foraminíferos bentónicosen todos estos puntos se encuentran asociados a los géneros de amonoideos Pseudohaploceras,Pedioceras, Nicklesia, Buergliceras y Karsteniceras, cuya presencia conjunta con los foraminíferosindica una edad de Barremiano inferior.El análisis micropaleontológico y petrográfico de estos niveles calcáreos muestra característicasmuy similares y la presencia homogénea de la asociación fósil encontrada hace que se considerenestos niveles calcáreos como un “bioevento” con posible relevancia estratigráfica dentro de laFormación Paja.La baja diversidad en los foraminíferos bentónicos podría indicar un ambiente anóxico, fuertementeconectado a la línea de costa y a condiciones hipersalinas. El hecho de que la macrofauna seencuentre dispuesta en forma caótica ayuda a soportar esa conclusión.
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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) | 0.001 | 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 | 0.001 |
| 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".