BGS Rock Classification Scheme

Volcaniclastic-sandstone, dacitic

Code	DAVST
Description	Volcaniclastic-sandstone, dacitic
Qualifiers	dacitic
Definition	Lithified clastic material >10% debris formed by volcanic processes; <25vol% pyroclastic fragments, sand grade (0.032-2mm); chemically normal; quartz 20-60% QAPF, feldspar >65% plagioclase
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/DAVST

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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.