The<scp>L</scp>eporid<scp>D</scp>atum: a late<scp>M</scp>iocene biotic marker
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Although L agomorpha (rabbits, hares and pikas) have a long evolutionary history in E urasia and A frica, including primitive genera of E urasia historically considered assignable at the family level to L eporidae, the predecessors of modern rabbits were absent throughout this vast region for most of the M iocene until late in that epoch. During the early and middle M iocene, crown group L eporidae differentiated in N orth A merica, then dispersed to northern A sia in the late M iocene around 8 Ma (million years before present) and afterward. They then spread widely and apparently rapidly throughout E urasia, reaching S outh A sia by 7.4 Ma and penetrating A frica about 7 Ma . The apparently abrupt introduction of L eporidae is a striking late M iocene event that we call the L eporid D atum. Perceived in terms of biochrons, the L eporid D atum includes localities in E urope and western A sia of late MN 11 ( M ammifères N éogènes system) age and younger, and precedes by less than one million years the B ahean‐ B aodean land mammal age boundary in C hina. The late M iocene spread of L eporidae throughout E urasia was a successful invasion in terms of the numerous occurrences and abundant fossils preserved. Where dating is sufficiently robust, the L eporid D atum is late M iocene, nowhere certainly more than ∼8 Ma . In contrast to this sudden and widespread invasion, rare older finds suggest two possible refinements to this scenario: stem lagomorphs close to modern L eporidae may have lingered into the middle M iocene of E urasia, or an independent, unsuccessful leporid invasion from N orth A merica may have preceded the 8 Ma datum. The L eporid D atum marks an important palaeoecological event for the O ld W orld and complements the significance of molecular dates for origins of modern genera.
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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 | 0.002 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.011 |
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 it