LATE HETTANGIAN (EARLY JURASSIC) AMMONITES FROM TASEKO LAKES, BRITISH COLUMBIA, CANADA
Bibliographic record
Abstract
Abstract: The Taseko Lakes area yields the most diverse and well‐preserved late Hettangian ammonite assemblage in British Columbia. In total, 27 ammonite taxa are described, of which Fergusonites hendersonae , Eolytoceras constrictum and Pseudaetomoceras victoriense are new. Based on this study, Phylloceras cf. asperaense Hillebrandt, Togaticeras togatum (Neumayr), T . aff. goisernense Rakús, Eolytoceras aff. guexi Taylor, Discamphiceras aff. silberlingi Guex, Schlotheimia cf. cuevitensis Hillebrandt and Franziceras aff. graylockense Taylor are newly recognized in the North American Mineralense Zone whereas Nevadaphyllites psilomorphus (Neumayr), N . aff. compressus Guex, Fergusonites hendersonae sp. nov., Eolytoceras chongi Hillebrandt, E . constrictum sp. nov., Paracaloceras spp. A and B, P .? spp., Metophioceras ? sp. and Schreinbachites ? aff. laqueoides (Hyatt) are newly recognized in the Rursicostatum Zone. Discamphiceras silberlingi , D . sp. nov., Alsatites aff. bipartitus (Hillebrandt), Alsatites sp., Pseudaetomoceras victoriense sp. nov. and Paracaloceras aff. varaense Hillebrandt are newly recognized in both the Mineralense and Rursicostatum zones. The Taseko Lakes fauna allows clear correlations with contemporaneous strata in other areas of North America as well as with the Canadensis Zone and probably the Arcuatum horizon of the South American succession. Broad correlations are also possible with Hettangian or lowest Sinemurian strata in New Zealand and the eastern Tethys. Furthermore, the Taseko Lakes fauna permits correlation of the Mineralense and Rursicostatum zones with the circum‐Mediterranean Marmoreum Zone. Finally, this fauna suggests that the Mineralense Zone and the lower to middle portion of the Rursicostatum Zone in Taseko Lakes are equivalent to the Complanata Subzone whereas the upper portion of the Rursicostatum Zone correlates with the Depressa Subzone of the north‐west European Angulata Zone.
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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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".