Detailed outcrop and core measured sections of Upper Cambrian and Middle Ordovician sandstones (and associated facies), southwestern Ontario
Bibliographic record
Abstract
Upper Cambrian and Middle Ordovician units, particularly the Potsdam and Shadow Lake sandstone units, of southwestern Ontario may harbour potential for natural gas resources, groundwater resources, Carbon Capture and Storage (CCS), and/or toxic waste disposal, but have not been fully studied in detail over the region. This report presents 5 outcrop and 16 core measured sections of these strata, descriptions of the facies encountered, and a few comments on their resource potential. Potsdam (Mount Simon) Formation facies include dominant thick bedded medium to coarse sandstone, arkosic coarse sandstone to conglomerate, and minor dark siltstone and dolostone, interpreted to represent deposition in a shallow nearshore to shoreline setting during initial upper Cambrian transgression. Theresa (Eau Claire) Formation facies include interbedded sandy dolostone and dolomitic fine to medium grained sandstone and minor bioturbated siltstone, interpreted to represent shallow subtidal to nearshore deposition. Shadow Lake Formation facies include dominant well sorted medium grained sandstone, poorly sorted fine to coarse sandstone, reddish mottled mudstone, and grey siltstone interbedded with greenish calcisiltite/limestone/dolostone in the upper parts of the formation. This suite is interpreted to represent deposition in shallow nearshore, shoreline and subaerial environments during the initial Middle Ordovician regional transgression over the peneplained Precambrian and Upper Cambrian unconformity surface, from which the detritus was derived. The porous and permeable Potsdam Formation yields oil and gas, and may provide further unstudied potential for hydrocarbons, groundwater, CCS or toxic waste disposal. The Shadow Lake Formation is not currently recognized to produce hydrocarbons (although these strata are in reservoir continuity with productive Cambrian units in places), but harbours significant unevaluated potential for oil and gas, groundwater and perhaps CCS.
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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 | 0.001 | 0.002 |
| 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) | 0.005 | 0.001 |
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".