The solid rock layer beneath the soil and subsoil.
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Bedrock is the solid, consolidated rock layer that lies beneath the soil, subsoil, and unconsolidated sediments of the Earth's surface. It forms the parent material from which soils are weathered over long periods and provides the geological foundation for landscapes and aquifers. Bedrock can be igneous, sedimentary, or metamorphic, and may lie at the surface (outcrop) or hundreds of metres below. Its composition influences soil chemistry, drainage, and fertility: limestone bedrock produces alkaline soils rich in calcium, while granite produces acidic, sandy soils. In agriculture, bedrock depth affects rooting depth, water-holding capacity, and vulnerability to erosion, and it constrains the design of drainage, irrigation, and foundations. Bedrock also shapes aquifers, springs, and groundwater flow. Geologists map bedrock using boreholes, seismic surveys, and outcrop studies. Understanding bedrock is essential for land-use planning, well siting, and the long-term sustainability of farming systems on shallow soils.
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