Darriwilian graptolites of the Hamburg succession (Dauphin Formation), Pennsylvania, and their geologic significance
Bibliographic record
Abstract
Graptolites from the Dauphin Formation in the allochthonous Hamburg succession of the Appalachians in Pennsylvania, USA, are late Darriwilian (Da) 3 to early Da 4 age (Middle Ordovician); this age range constrains the timing of the latest depositional episode before the terrane was tectonically mobilized. These rocks were emplaced into the Martinsburg foreland basin of Laurentia during the Taconic orogeny in the early Caradoc (Late Ordovician). Nineteen taxa are described defining a narrow biostratigraphic interval. Among the characteristic fauna collected from of the Da 4 Zone are Pterograptus elegans Holm, Cryptograptus schaeferi Lapworth, Hustedograptus teretiusculus (Hisinger) ?, Haddingograptus oliveri (Bouček), Glossograptus hincksii (Hopkinson), Pseudophyllograptus angustifolius s.l. (J. Hall), and Archiclimacograptus cf. riddellensis (Harris). Tetragraptus cf. erectus Mu et al. found with the above suggests a level low in the Da 4 Zone and a limited occurrence of Bergstromograptus crawfordi (Harris) may indicate some strata within the Da 3 Zone. Proposed new forms include Pseudotrigonograptus ? ricardo sp. nov., and at least two reteograptids. Four examples of Kalpinograptus and Kalpinograptus ? may be new.
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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 | 0.000 |
| 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 | 0.000 | 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 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".