Strontium isotopes and the geographic origins of camelids in the Virú Valley, Peru
Bibliographic record
Abstract
This study presents the strontium isotopic composition of camelid tooth enamel from Huaca Santa Clara, Huaca Gallinazo, and Huancaco in the Virú Valley, northern Peru. These sites were occupied during the Early Intermediate Period (EIP, c. 200 BCE-600 CE) with Huaca Santa Clara and Huancaco being associated with ritual sacrifices of camelids during the late Middle Horizon (LMH, 850–950 CE for Huancaco and c. 1150 CE for Huaca Santa Clara). Most camelids had strontium isotopic compositions that fell within the predicted isotopic range for the Virú Valley. Isotopic compositions of the serially sampled teeth suggest most camelids did not move between regions with different strontium isotope baselines during enamel formation. At Huaca Gallinazo, the capital of the Virú Polity during the EIP, all the camelids appeared to be local to the lower Virú Valley. At Huaca Santa Clara, a regional administrative center, butchered individuals associated with the EIP occupation had strontium isotope ratios reflecting primarily local origins, with some evidence of individuals from the highlands. The scarified individuals at Huaca Santa Clara (late Middle Horizon) all had strontium isotope ratios consistent with a local origin in the Viru Valley. At Huancaco, some butchered (EIP) and sacrificed (LMH) camelids were local to the Virú Valley but this site may have included more individuals with higher tooth enamel 87 Sr/ 86 Sr, possibly originating in the middle and upper valley regions relative to the other two sites. These data confirm that camelid husbandry was present on the north coast at least as early as the EIP and this practice was maintained through the late Middle Horizon after the waning of north coast polities such as Virú and Moche.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.010 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".