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In ascending order, the stratigraphic units of the Oak Ridges Moraine are: Paleozoic bedrock, Lower deposits, Newmarket Till, Oak Ridges Moraine sediments, and Halton till. The latter is predominantly a massive to laminated mud unit with low stone count and local interbeds of sand and gravel. Along the upper flanks of the ORM the unit is 1-5 m thick and southward can increase in thickness up to 30 m. Halton Till forms a discontinuous aquitard. This low permeability unit partially confines ORM aquifers and restricts recharge. Groundwater is fresh, but very hard. Iron concentrations are above the aesthetic objective. |
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Physiography
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| Hydrogeological region | Southern Ontario Lowlands |
| Hydrogeological context | |
| Relief | Oak Ridges moraine has elevations around 430 m. Elevations are higher on the moraine ridge and decreases slightly on the edges. It forms the height of land east of the Niagara Escarpment. |
| Area | 2122.00 km2 |
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Lithology
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| Description | In ascending order, the stratigraphic units of the Oak Ridges Moraine are: Paleozoic bedrock, Lower deposits, Newmarket Till, Oak Ridges Moraine sediments, and Halton till. The latter is predominantly a massive to laminated mud unit with low stone count and local interbeds of sand and gravel. Along the upper flanks of the ORM the unit is a 1-5 m thick and southward can increase in thickness up to 30 m. |
| Source | |
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Aquifer
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| Aquifers | List of aquifers
none aquifer |
Groundwater Information Network