Origins of Prehispanic Camelid Wool Textiles from the North and Central Coasts of Peru Traced by Carbon and Nitrogen Isotopic Analyses
Bibliographic record
Abstract
Carbon and nitrogen isotopic compositions of wool textiles from the north (Virú, Early Intermediate Period) and central (Chancay, Late Intermediate Period) coasts of Peru were used to reconstruct the diet and habitat of the camelids (llamas and alpacas) from which they were produced in order to better understand the regional political economies. The Chancay textiles were derived from camelids primarily raised on high-altitude C3 grasslands. Similarly, isotopic data from Virú textiles assembled in north-coast styles are consistent with the importation of highland camelid wool. For both Virú and Chancay, imported raw materials were crafted in local styles, serving as an effective means of materializing corporate power. Stylistically foreign (noncoastal) Virú textiles were characterized by carbon isotopic compositions similar to those for camelids recovered from Early Intermediate Period sites in the Virú Valley and suggest that these textiles originated in the yungas (1,000–2,300 m asl) or the low sierra (2,300–3,500 m asl). Accordingly, although highland camelid wool was imported to the coast, a simple model of exchange involving the movement of wool textiles exclusively from the puna or the altiplano to the coast is untenable.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".