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The Vars-Winchester esker area consists of four main geological units. In ascending order, these units are: bedrock, till, glaciofluvial sand and gravel in eskers and Champlain Sea mud and sand. The latter may be overlain by alluvial sediments and organic deposits. The till is an extensive sheet that may be discontinuous. It is typically massive and considered to be 'over-consolidated'. The top surface of the regional till, where exposed, is sculpted into elongate, parallel, streamlined ridges (drumlins) that are oriented north-south. A thin (below 2 m) gravel sheet is located above the regional till and beneath Champlain Sea mud in the north part of the study area. The gravel sheet is considered as part of the contact zone aquifer with moderate hydraulic conductivity; however the till has low hydraulic conductivity. This unit is thin and confined by the Champlain Sea mud, except where till outcrops. |
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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 | 5469.00 km2 |
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Lithology
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| Description | The Vars-Winchester esker area consists of four main geological units. In ascending order, these units are: bedrock, till, glaciofluvial sand and gravel in eskers and Champlain Sea mud and sand. The latter may be overlain by alluvial sediments and organic deposits. The till is an extensive sheet that is locally discontinuous. It is typically massive and considered to be ""overconsolidated"". The top surface of the regional till, where exposed, is sculpted into elongate, parallel, streamlined ridges that are oriented north-south. A thin (below 2 m) gravel sheet occurs above the regional till and beneath Champlain Sea mud in the north part of the study area. |
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Aquifer
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| Aquifers | List of aquifer
none |
Warning
Groundwater Information Network