Redescription of the Late Cretaceous (late Santonian) ammonite Desmoscaphites bassleri Reeside, 1927, from the Western Interior of North America
Bibliographic record
Abstract
The Late Cretaceous scaphitid ammonite Desmoscaphites bassleri Reeside, 1927, is redescribed based on newly collected material from Montana. This species is an important index fossil and demarcates the uppermost Santonian in the U.S. Western Interior. It is widely distributed and extends from Alberta to New Mexico, primarily along the western margin of the Interior Seaway. The adult shell is moderately stout and closely coiled, with small ventrolateral tubercles on the body chamber. Microconchs are smaller than macroconchs but otherwise similar in morphology. There is an abrupt change in ornamentation on the late juvenile whorls from coarse, widely spaced ribs to threadlike, more closely spaced ribs, with a pronounced sinuosity. The ribs later become more widely spaced on the shaft of the body chamber and more closely spaced again near the aperture. The early whorls are characterized by constrictions, which represent flexures in the shell wall. The constrictions first appear at a shell diameter of approximately 3 mm and occur regularly thereafter at intervals of 65–90° up to a shell diameter of approximately 15 mm. The suture is characterized by a trifid first lateral lobe. This lobe does not pass through an asymmetrically bifid stage during ontogenetic development.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".