Middle <scp>O</scp>rdovician <i><scp>A</scp>porthophyla</i> brachiopod fauna from the roof of the <scp>W</scp>orld, southern <scp>T</scp>ibet
Bibliographic record
Abstract
Abstract A D arriwilian (late M iddle O rdovician) brachiopod fauna from the L ower F ormation of the C hiatsun G roup at J iacun, northern N yalam, southern T ibet, consists of ten brachiopod species, forming a distinct A porthophyla – P aralenorthis A ssociation. Its taxonomic composition is typical of the A porthophyla F auna that occupied lower BA 2 to upper BA 3 benthic environments on sandy lime mud substrates. The occurrence of P aralenorthis in southern T ibet is confirmed for the first time, represented by P . costata sp. nov. Numerical analyses ( PCA and CA ) of 18 D arriwilian brachiopod faunas from ten palaeoplates or terranes indicate that: (1) the A porthophyla F auna was confined to a specific latitudinal belt although it had a wide lateral distribution from the large palaeocontinents of G ondwana to L aurentia; (2) the S aucrorthis F auna, a typical late M iddle O rdovician regional fauna, is limited to a much smaller area, marginal to the G ondwana supercontinent; (3) the strong provincialism persistent in the late M iddle O rdovician contributed to increased gamma biodiversity during the G reat O rdovician B iodiversification E vent.
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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 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.004 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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; both teacher heads agree on what is shown here.
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".