Chindadn Bifaces and the Archaeology of Terminal-Pleistocene Alaska
Bibliographic record
Abstract
Chindadn bifaces are one of the few diagnostic lithic hallmarks of the terminal Pleistocene in interior Alaska. This paper presents the first regional overview and quantitative technological analysis of bifaces from archaeological sites dating 11,400 calendar years ago and earlier, based on characteristics of reduction, shaping, use, and discard. Overall, finished bifaces are small and extremely thin, with evidence of expedient production and use. Four basal-shape groups are present, falling semi-consistently into four descriptions. Convex-based bifaces appear as a distinct group with teardrop outline, informal reduction techniques, and minimal evidence for utilization. Triangular and subtriangular bifaces, exhibiting diverse reduction characteristics and low rates of hafting wear and breakage, appear to be more generalized point tips designed to conserve raw materials in Beringian climates. Concave-based bifaces show intensive flaking and high rates of haft-element breakage and abrasion, indicating they do not fit within a strict definition of Chindadn biface technology.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.006 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".