The guidance given in BS5930:1981 for rock weathering descriptions at the material scale is considered to be inappropriate for UK practice, and is seldom applied to rock core logging. Practitioners turn to alternative weathering schemes for logging rock cores, some of which are inappropriate at the material scale; others are intended for specific, uniform lithologies and may also prove to be unsuitable when geological conditions vary from the presumed uniformity. The authors present examples from various geological situations, to demonstrate the difficulties arising when existing published weathering schemes are applied. The difficulties associated with deriving mass zonations from material scale descriptions are considered. The description of cores at the material scale is considered to require quantified detail, independent of the prescribed schemes currently existing.

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