Organic Layer, This layer contains ONLY humus, Horizon O, Very dark in color, The thinnest horizon, Topsoil, Has many roots, Horizon A, Has highly weathered rocks and minerals, Subsoil, Roots continue into this layer, some organic material, This layer contains medium-sized rocks, Horizon B, Parent Material, This layer contains partially weathered rock and very little (if any organic material), This layer forms when bedrock starts to be weathered and broken up, Horizon C, Bedrock, This layer is SOLID ROCK, Horizon R, Groundwater for wells can be found here.

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