New Palaeogene sponges from the Red Bluff Tuff, Chatham Island, New Zealand
Bibliographic record
Abstract
Abstract A horizon with well‐preserved sponge body fossils occurs in the late Palaeocene–early Eocene Red Bluff Tuff of Chatham Island, located some 850 km east of mainland New Zealand. The body fossils are ‘glass’ and ‘lithistid’ sponges in which most of the original silica has been replaced by calcite during diagenesis, strewn in approximate growth position around the same horizon. We describe two new species, a lyssacinosidan (non‐rigid) glass sponge Rossella cylindrica sp. nov. (Class Hexactinellida, Order Lyssacinosida, Family Rossellidae), significant as it provides only the second species in the fossil record of the genus Rossella , and a very large, foliose, tretodictyid (rigid) glass sponge, Anomochone chathamensis sp. nov. (Class Hexactinellida, Order Hexactinosida, Family Tretodictyidae). A large, nodulose lithistid sponge attributed to the Family Corallistidae, but not identifiable to genus, is also described. This material provides a window into the early Tertiary palaeoenvironment of what is now the southern Pacific Ocean. urn:lsid:zoobank.org:act:C8CEF5C8‐FD21‐4515‐9A7C‐3C6FCE6F3ACE for Anomochone chathamensis urn:lsid:zoobank.org:act:4C2F6456‐2B55‐40EF‐9B06‐26753CE85354 for Rossella cylindrical
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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 | 0.003 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 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; 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".