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Wrangellia rocks are more common in the southern part of the study area and in the mountains. The regional unconformity surface of the basement is commonly fractured and heavily-weathered making the upper meter or so of basement more permeable. The basement topography likely influenced the distribution and thickness of the unconformably-overlying Lower Nanaimo Group units (Johnstone et al., 2006; Ward and Stanley, 1982). |
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Physiography
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| Hydrogeological region | Cordillera |
| Hydrogeological context | |
| Relief | The regional topography ranges from sea level at the coast, up to 1819 m (Mount Arrowsmith). The coastal plain terrain is sub-horizontal with slopes lower than 6% except along incised rivers valleys (up to 20%). |
| Area | 210.00 km2 |
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Lithology
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| Description | The bedrock unit is mainly composed of the metamorphic and intrusive Wrangellia rocks. |
| Source | |
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Aquifer
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| Aquifers | |
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