Darriwilian species of<i>Histiodella</i>(Conodonta) in the Argentine Precordillera
Bibliographic record
Abstract
Mestre, A. & Heredia, S., iFirst article. Darriwilian species of Histiodella (Conodonta) in the Argentine Precordillera. Alcheringa, 141–150. ISSN 0311-5518. The Middle Ordovician successions in the Central Precordillera of Argentina are characterized by carbonate and fine mixed carbonate/siliciclastic deposits. Two middle Darriwilian sections spanning the Eoplacognathus pseudoplanus to Eoplacognathus suecicus Zones were sampled for conodonts, among which were found species of Histiodella. We revised the biostratigraphical distribution of these species in the Middle Ordovician of the Precordillera. This study confirms that the Darriwilian species of Histiodella present in the Argentine Precordillera have a similar distribution to those of equivalent age in Newfoundland, South China and the Baltic region. On the other hand, the overlap in the ranges of H. holodentata and H. kristinae seems to be restricted to a fairly short interval in the upper part of the E. pseudoplanus Zone. We also propose that the FAD of H. kristinae Stouge is accurately positioned in the upper part of the E. pseudoplanus Zone; thus this species should not be used to define the base of the E. suecicus Zone in the Ordovician biozonation of the Argentine Precordillera. Ana Mestre [amestre@unsj.edu.ar] and Susana Heredia [sheredia@unsj.edu.ar], Conicet—Instituto de Investigaciones Mineras, Facultad de Ingeniería, Universidad Nacional de San Juan. Av. Libertador y Urquiza (5400) San Juan, Argentina. Received 16.2.2011, revised 27.4.2011, accepted 13.5.2011.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 |
| 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".