Holocene Stratigraphy and a Preliminary Geomorphic History for the Palomas Basin, south-central New Mexico
Bibliographic record
Abstract
Holocene alluvial records have been established in many parts of the American Southwest but are lacking in the central Palomas Basin of south-central New Mexico. There, east-draining streams and arroyos feature three widespread main-stem deposits that are inset into one another and have distinct surface characteristics. These are flanked by alluvial fan deposits comparable in age to those on the main-stem. We use five new radiocarbon ages and pre-existing geochronology to compare cycles of aggradation and incision between the axial river, the Rio Grande, and the lower reaches of two of its tributaries. In lower Canada Honda, an alluvial fan at the mouth of a side drainage expe rienced soil development during the latest Pleistocene followed by early to middle Holocene aggradation. An adjoining alluvial fan was aggrading at approximately 2600 cal yr BP. After a poorly constrained incision event, an inset main-stem deposit aggraded approximately 600 cal yr BP and grades into an older Rio Grande terrace deposit previously dated at 5000–670 cal yr BP. Synthesizing geochronologic data for the basin, we infer probable incision during 850–550 cal yr BP in Rio Grande tributaries. This incision occurred after a relatively dry interval and during a period of enhanced summer monsoons, consistent with previously established climate-response models. Aggradation appears to have been relatively continuous along high-or der tributaries during most of the Little Ice Age (approximately 500–70 cal yr BP) to the present.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 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".