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The Soils of Brant County - Agriculture and Agri-Food Canada

The Soils of Brant County - Agriculture and Agri-Food Canada

The Soils of Brant County - Agriculture and Agri-Food Canada

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IAlluvium I Burford <strong>Soils</strong> I Caledon I Dumfries <strong>Soils</strong><strong>Soils</strong>Alluvial sedimentsII Lacustrine s<strong>and</strong>I <strong>and</strong> loamy s<strong>and</strong>IL ._II__ I __L_I , _..L_L 1 Satina Formation L L _L I ...1._ _.L_(shale, gypsum, dolostone) 1 1-.L -L 1 -._1Figure 8 .Schematic l<strong>and</strong>scape cross-section showing soil parent materials associated with the Gr<strong>and</strong> River <strong>and</strong> the Paris Morainenear ParisPlainfield <strong>and</strong> Walsingham <strong>Soils</strong>Fox <strong>and</strong> Brady <strong>Soils</strong>Bookton <strong>and</strong>Berrien <strong>Soils</strong>Figure 9 .Schematic l<strong>and</strong>scape cross-section showing the relationship <strong>of</strong> surficial s<strong>and</strong>s to underlying deposits on the s<strong>and</strong> plainnear Cathcart<strong>The</strong> coarser s<strong>and</strong> sediments deposited in the shallowwaters <strong>of</strong> glacial lakes Whittlesey <strong>and</strong> Warren, are mapped asFox, Brady <strong>and</strong> Granby soils . <strong>The</strong> Plainfield, Walsingham <strong>and</strong>Waterin soils have developed in the wind-modified fine s<strong>and</strong>sthat represent deeper water deposits <strong>of</strong> the same glacial lakes .Waterloo <strong>and</strong> Heidelberg soils are developed on the fine s<strong>and</strong>yloam <strong>and</strong> very fine s<strong>and</strong>y loam sediments . <strong>The</strong> l<strong>and</strong>scape relationships<strong>of</strong> s<strong>and</strong>y lacustrine <strong>and</strong> eolian soils in the <strong>County</strong> areshown schematically in Figure 9 .Fine-grained lacustrine silt <strong>and</strong> clay sediments occupymost <strong>of</strong>the eastern half <strong>of</strong>the <strong>County</strong>. <strong>The</strong>se consist <strong>of</strong> laminatedto varved silts <strong>and</strong> clays which are highly susceptible toerosion on bare slopes ; they constitute al<strong>and</strong>slide hazard alongthe Gr<strong>and</strong> River where steep banks occur. Thickness is variablewith the underlying topography. <strong>The</strong> upper surface is essentiallyflat with a gently southeasterly slope. Up to 35 metres <strong>of</strong>lacustrine sediment is present at Harrisburg, 40 metres near St .George, 20 metres at Ohsweken, <strong>and</strong> lesser amounts wheredrift is shallow in Tuscarora Township <strong>and</strong> where drumlinsprotrude up through the silts <strong>and</strong> clays . Carbonate concretionsare common locally ; these are irregularly shaped with maximumdiameters <strong>of</strong> 20 cm <strong>and</strong> maximum thicknesses <strong>of</strong> 1 cm .Pebbles <strong>and</strong> cobbles are rare. Principal clay minerals inthe claysize fraction are chlorite <strong>and</strong> illite with only minor amounts <strong>of</strong>exp<strong>and</strong>ing clay minerals (7) . However, non-clay minerals suchas quartz <strong>and</strong> calcite predominate over the clay minerals .

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