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Provides information on zones of rock strength and the local factors controlling it (e.g. weathering, presence of water and mechanical discontinuities such as fissures, joints, shears and faults). Definitions of the engineering strength of rocks and fine soils are provided as minimum, maximum and typical strengths. The classification used in the dataset is based upon the British Standard 5930 (1999) code of practice for site investigation (modified 2003 and 2009).