BGS Rock Classification Scheme

Phosphate-gravel - A type of phosphate-sediment. In the Rock Classification Scheme, it is one in which over 25% of clasts are larger than 2 mm. The grain size classes are defined in the same way as the siliciclastic sediments. British Geological Survey Research Report RR/99/03, section 4.1, table 10 and fig. 8. See also: silicate-gravel.

Code PHGV
Description Phosphate-gravel - A type of phosphate-sediment. In the Rock Classification Scheme, it is one in which over 25% of clasts are larger than 2 mm. The grain size classes are defined in the same way as the siliciclastic sediments. British Geological Survey Research Report RR/99/03, section 4.1, table 10 and fig. 8. See also: silicate-gravel.
Qualifiers No qualifiers currently exist.
Definition Grain supported sediment with components >50% phosphates such as those of calcium, aluminium & iron. Clasts >50% or predominantly gravel-grade, >2mm.
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/PHGV

CAVEAT

"Thumbnail" definitions attached to some of the table entries are an interim attempt to provide simple short descriptions of the "unqualified" rock types presented within the BGS Rock Classification Scheme. Every effort has been made to ensure accuracy and consistency but minor contradictions or omissions might be present. The BGS welcomes any feedback pointing out such minor imperfections and/or providing constructive comment and suggestions for improvement of the definitions. In the first instance such feedback should be directed to Dr Tim McCormick.