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Tunbridge Soil Series

Vermont State Soil

Woods of Vermont typical Vermont forests include white ash, American beech, white birch, yellow birch, hemlock, white pine, red spruce, red maple, and sugar maple. Photo by Stanley Zimny / Flickr (noncommercial use permitted with attribution).

Official State Soil of Vermont

Vermont designated Tunbridge soil series as the official state soil in 1985. All State Soils

The Tunbridge series consists of loamy, well-drained soils that formed in Wisconsin-age glacial till. These soils are 20 to 40 inches deep over schist, gneiss, phyllite, or granite bedrock. They occur extensively in mountainous areas of Vermont, in all but one county.

Tunbridge soils are used mainly for woodland. White ash, American beech, white birch, yellow birch, hemlock, white pine, red spruce, red maple, and sugar maple are typical species. Sugar maple is especially important; Vermont produces the largest amount of maple syrup in the U.S (the sugar maple is Vermont's state tree, and maple is the official state flavor). Some areas have been cleared and are used for hay and pasture. Recreational uses are common on these soils. They include trails for hiking, mountain biking, snowmobiling, and skiing.

How are Soils Classified?

Botanists look at plant features, such as leaf shape and number of flower petals, to describe and classify plants. Soil scientists look at things like soil horizons (layers) and depth to bedrock to describe and classify soils. Tunbridge Soil Series characteristics:

Surface layer: very dark brown, partially decomposed organic material
Subsurface layer: gray fine sandy loam
Subsoil - upper: dark brown fine sandy loam
Subsoil - lower: brown channery fine sandy loam
Bedrock: schist