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From bedrock upward the Quaternary sedimentary succession consists of diamicton, esker sand and gravel and Champlain Sea mud and littoral sand. Locally alluvial sediment and organic deposits are present at the surface. Champlain Sea deposit includes three subunits, in ascending order: rhythmically laminated mud and sand, massive mud and stratified mud, locally with sand layers near or at the top. The deposit is considered as an aquitard, showing low hydraulic conductivity. It protects the underlying aquifers from surface contamination, but it also limits the recharge of the aquifer system. |
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Physiography
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| Hydrogeological region | St. Lawrence Platform |
| Hydrogeological context | |
| Relief | The region is a low-relief landscape with hills commonly controlled by bedrock and drumlins. Topography ranges from approximately 35 to 120 meters above sea level. |
| Area | 3104.00 km2 |
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Lithology
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| Description | Champlain Sea deposit includes three subunits, in ascending order:
i) rhythmically laminated mud;
ii) massive mud;
iii) stratified mud, locally with sand layers near or at the top. |
| Source | |
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Aquifer
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| Aquifers | List of aquifer
Not Applicable |
Warning
Groundwater Information Network