Biodiversity & Conservation

MarLIN Glossary

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Particle-size
Of sediment particles - the main characteristic for classifying rock-derived sediments. By granulometric analysis (q.v.), it is possible to distinguish: clay (< 0.004 mm); silt (0.0625-0.004 mm); sand (0.0625 mm - 1 mm); granules (2-4 mm); pebbles (4 mm - 64 mm); cobbles (64-256 mm), and boulders (> 256 mm) (based on Wentworth, 1922). The MNCR habitat classification combines or subdivides these categories to separate substratum types in a biologically meaningful way (see descriptions in this glossary and Hiscock, 1990).

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Glossary references