Maximum depositional age of the Neoproterozoic Jacobsville Sandstone, Michigan: Implications for the evolution of the Midcontinent Rift: REPLY
Bibliographic record
Abstract
We thank T.J. Bornhorst (2018) for consideration of our work on the Jacobsville Sandstone in northern Michigan. We engaged in this research to advance understanding of the geology of the Lake Superior region. As we began this project, we were fascinated that little attention had been paid to refining the lithostratigraphic and chronostratigraphic understanding of the Jacobsville Sandstone; our work is ongoing. Since publication of Malone et al. (2016a), we have analyzed ~400 additional zircons from 3 Jacobsville Sandstone exposures in Ontario (Canada). We will collect and analyze Jacobsville subsurface occurrences in the next few months. Bornhorst’s comment questioned our sampling and analytical methodologies, and the statistical factors used to determine the Jacobsville maximum depositional age (MDA). He also challenged our interpretations as well as “…far-reaching conclusions …” here. We find these generalizations puzzling, but welcome this opportunity to expand our discussion of the Jacobsville Sandstone in Malone et al. (2016a).
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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 | 0.005 | 0.019 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.005 |
| Scholarly communication | 0.002 | 0.005 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.008 | 0.017 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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".