Anatomy of a Jurassic Theropod Trackway from Ardley, Oxfordshire, U.K.
Bibliographic record
Abstract
Ardley Quarry, Oxfordshire, central England, preserves a most remarkable ichnological record of dinosaur activity on a single 168 Ma old trackway-bearing horizon. This horizon reveals over 40 dinosaur trackways, most of them sauropod, but including several giant theropod trackways tentatively attributed to Megalosaurus, the first creature of its kind recognized and assigned to Dinosauria. A 60 meter-long portion of one theropod trackway (no. 80) is systematically characterized in terms of pitch, yaw, and roll of successive footprints. Variations among these parameters correspond closely with acceleration/deceleration intervals in the trackway, impressed by the animal in wet calcareous mud within the tidewater zone of a mid-Jurassic coastal plain. Energy expended (1.4 watts) by the animal in making each footprint in the trackway is comparable to the resting metabolic rate of modern birds and mammals. Efforts by the theropod to accelerate are reflected by intervals of forward pitch of footprints; here the backward component of the force exerted upon the ground exceeds the forward component. Conversely, during braking (deceleration) intervals, footprints tend to exhibit a backward pitch in which the forward component of the force will have exceeded the backward component. Maximum positive yaw (outward from the midline of the trackway) generally corresponds with forward pitch. Positive yaw is greatest where positive (outward) roll is maximum. Measurements of pitch, yaw, and roll of dinosaur footprints hold potential for revealing fundamental locomotor characteristics of dinosaurs and for estimating acceleration and speed of an animal from its footprint record.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.013 | 0.002 |
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".