Distribution of Devonian Stromatoporoid Buildups in the Eastern Basin and Range
Bibliographic record
Abstract
Abstract Devonian carbonates in the Basin and Range Province of western Utah and eastern Nevada form part of a large, carbonate-dominated depositional complex that occupied the western margin of the mid-Paleozoic North American craton. These Devonian carbonates are generally continuous with and coeval with hydrocarbon reservoirs in the Alberta foreland basin of Canada. This stratigraphic association and the production of modest amounts of oil from the Devonian in Nevada raise the possibility that the carbonate-reef play concepts that have been successful in Canada could be applied to the Devonian of the Basin and Range. For this review paper, we collected descriptions of more than 100 measured outcrop sections in the literature and oil-industry data from about 45 wells, and integrated the descriptions with published sequence stratigraphic frameworks for the Middle and Upper Devonian. We assigned the carbonates to eight depositional environments, ranging from supratidal to deep subtidal, and correlated the measured sections across four cross sections. Paleogeographic maps based on limited age control suggest that two populations of stromatoporoid buildups occur: a shelf-edge group that is probably not prospective for hydrocarbons, and a middle-shelf group that may be prospective. However, the Basin and Range buildups are smaller and less numerous than those in Canada, lack structural control and internal biofacies zonation, and are mud supported. From the hydrocarbon exploration perspective, carbonate buildup distribution is probably less important than timing and development of fracture porosity.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.000 | 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".