Upper Cretaceous Nanaimo Group of Vancouver Island as a potential bedrock aquifer zone: summary of previous literature and concepts
Bibliographic record
Abstract
A new inquiry into the groundwater potential of the Nanaimo Lowlands is being jointly undertaken by concerned municipal, provincial and federal agencies. Rapid population growth and expanding industrial development are, and will continue to, put pressure on the limited groundwater resources. The bedrock component of the project focuses on the characterization of the aquifer potential of the Upper Cretaceous Nanaimo Group, as a likely target of importance. This unit is a thick succession of 11 intertonguing sandstone-dominated and shale-dominated formations, of which only the lower 8 are present in the defined study area. As a preliminary step in the analysis, this report summarizes the most relevant information for these 8 units from the previously published geological literature, in order to focus attention on the zones and areas of most likely groundwater potential. The sandstone- and conglomerate-dominated units of the Comox, Extension and Protection formations have significant aquifer potential due to their potential for porosity and permeability, fracturing, and extensive development at reasonable depths over wide areas (with minor potential in the De Courcy Formation, present only near the surface in a small part of the study area). Conversely, the interbedded shale-dominated units of the Haslam, Pender, Cedar District and Northumberland formations are important because they may provide significant aquitard seal units, overlying the potential aquifer zones over wide areas of the Nanaimo Lowlands. Further study of the thickness, geographic and stratigraphic distribution, fracturing, and internal stratigraphic complexities of these 8 units of the Nanaimo Group will provide a more scientific basis for evaluation of the bedrock aquifer potential in the Nanaimo Lowlands region.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.007 | 0.009 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.005 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".