BGS Rock Classification Scheme

Clay, silty, gravelly, sandy [Unlithified Deposits Coding Scheme]

Code CZVS
Description Clay, silty, gravelly, sandy [Unlithified Deposits Coding Scheme]
Qualifiers silty   gravelly  sandy 
Definition Siliciclastic sediment, clay-grade, particles >75% <0.004mm. Sand-grade 0.032 to 2mm grains >gravel-grade >2 mm clasts >silt-grade 0.004 to 0.032mm particles, all 5-20%. Compostion & depositional environment not defined.
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/CZVS

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.