Optical luminescence dating of uplifted marine terraces along the Akatore Fault near Dunedin, South Island, New Zealand
Bibliographic record
Abstract
Abstract The south Otago coast is characterised by a flight of marine terraces which have formed and been uplifted in Quaternary time. Optical luminescence dating along the recently active Akatore Fault has provided burial ages for beach sands resting upon a wave‐cut platform in the up thrown block that are equal to or younger than 71 ± 14 ka, and a burial age of c. 20 ka for the loess cap. The ages on beach sands clearly indicate that motion on this fault has been relatively limited since the last interglacial, while the loess date constrains the age of at least one faulting event on the Akatore Fault at this locality, and two events on the fault farther south, to be younger than 21 ka. The 6 m high (above high sea level) sand units in the terrace shown here to date from the late part of the last interglacial, suggest that sea levels at that time (oxygen isotope substage 5a) may not have been as low as ‐18 m, but rather closer to modern sea level. These applications of optical luminescence dating, using green light and infrared stimulation of quartz luminescence, constitute a new approach to studying tectonic rates on faults and paleo‐sea levels.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".