AskDefine | Define bedrock

Dictionary Definition



1 solid unweathered rock lying beneath surface deposits of soil
2 principles from which other truths can be derived; "first you must learn the fundamentals"; "let's get down to basics" [syn: fundamentals, basics, fundamental principle, basic principle]

User Contributed Dictionary

see Bedrock



bedrock (uncountable, geology, mining, engineering, construction)
  1. The solid rock that exists at some depth below the ground surface. Bedrock is rock "in place", as opposed to material that has been transported from another location by weathering and erosion.
In mountainous regions, bedrock can be seen at the surface. However, these occurrences are more properly called outcrops. In construction and engineering, it is often desired to place foundations on bedrock in order to improve the stability of a structure.


underground solid rock
  • Finnish: peruskallio
  • Norwegian: grunnfjell
  • Swedish: urberg

Extensive Definition

Bedrock is the native consolidated rock underlying the surface of a terrestrial planet, usually the Earth. Above the bedrock is usually an area of broken and weathered unconsolidated rock in the basal subsoil. The top of the bedrock is known as rockhead and identifying this, via excavations, drilling or geophysical methods, is an important task in most Civil engineering projects. Superficial deposits (also known as drift) can be extremely thick such that the bedrock lies hundreds of metres below the surface.
A solid geologic map of an area will usually show bands of differing rock type , i.e., rock that would be exposed at the surface if all soil or other superficial deposits were removed. The different rock strata or layers that are indicated may be a result of either nonparallel (sloping) surface erosion at the edges of flat strata or normal surface erosion of tilted strata that has removed the upper portions of higher layers.
bedrock in German: Grundgebirge
bedrock in Dutch: Bedrock
bedrock in Norwegian: Grunnfjell
bedrock in Serbian: Бедрок (геологија)
bedrock in Finnish: Kallioperä
bedrock in Swedish: Berggrund

Synonyms, Antonyms and Related Words

aa, abyssal rock, basalt, base, basement, basic, basis, bearing wall, bed, bedding, belly, block lava, bottom, bottom side, bottommost, brash, breccia, breech, buttocks, central, conglomerate, crag, deepest, downside, druid stone, essential, festooned pahoehoe, floor, flooring, focal, fond, footing, foundation, fundament, fundamental, gneiss, granite, ground, grounds, groundwork, hardpan, igneous rock, indispensable, infrastructure, lava, life-and-death, life-or-death, limestone, living rock, lower side, lower strata, lowest, lowest layer, lowest level, lowest point, magma, mantlerock, material, metamorphic rock, monolith, nadir, nether side, nethermost, nethermost level, of vital importance, pahoehoe, pavement, pillar, pillow lava, porphyry, principle, pudding stone, radical, regolith, riprap, rock, rock bottom, rock-bottom, root, ropy lava, rubble, rubblestone, rudiment, sandstone, sarsen, schist, scoria, scree, seat, sedimentary rock, shelly pahoehoe, sill, solid ground, solid rock, stereobate, stone, stylobate, substantive, substratum, substruction, substructure, talus, terra firma, tower, tufa, tuff, underbelly, underbuilding, undercarriage, undergirding, underlayer, underlying level, undermost, underneath, underpinning, underside, understruction, understructure, vital
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