Initial results of a paleoanthropological survey of the Djibouti Afar
Bibliographic record
Abstract
Since its discovery in 2000, the DIK-1-1 partial skeleton ("Selam") has been under careful cleaning, preparation, and investigation, with preliminary results published in 2006.In addition to documenting the anatomy of the earliest and most complete infant skeleton dated to 3.3 Ma, the find enabled us to address several critical questions pertaining to the locomotion, behavior, and ontogeny of Australopithecus afarensis with implications for that of other early hominin species.When discovered, the upper part of the skeleton included the whole skull, scapulae, clavicles, vertebrae, and ribs, which were in a non-anatomical articulation and encased in a very compact sand stone block.Particularly, the occlusal aspect of the deciduous dentition was completely inaccessible, because the maxilla and mandible were in occlusion.Due to this, only parts of the labial and buccal sides of these teeth were examined thus far.Even though CT scan images were used to investigate growth patterns of the unerupted permanent dentition, allowing us to determine the age at death and sex of "Selam," we were not able to capture the occlusal morphology of the milk teeth using this technique.Cleaning and preparation of this extraordinary specimen has continued and we have made remarkable progress, recently including the separation of the very delicate jaws, making it possible to study the occlusal morphology of both upper and lower deciduous dentition for the first time.In this paper I will report on preparation work accomplished since 2006 and discuss the morphology and metrics of the DIK-1-1 milk teeth, comparing them with that of Au. afarensis, Au. africanus, and other available and relevant early hominin dentition.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| 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".