Rock Classification Scheme (BGS).pdf - The Water, Sanitation and ...
Rock Classification Scheme (BGS).pdf - The Water, Sanitation and ...
Rock Classification Scheme (BGS).pdf - The Water, Sanitation and ...
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level 1 level 2 level 3 level 4Groups of rocks shown inthis column are classifiedat different levels ofthe hierarchy.artificial<strong>and</strong> naturalsuperficialdepositsfragmentaligneousrocks <strong>and</strong>sedimentsvolcaniclasticigneous rocks<strong>and</strong> sedimentsvolcaniclasticsedimentary rocks<strong>and</strong> sedimentstuffitespyroclasticrocks <strong>and</strong>sedimentsallrocks<strong>and</strong>depositssedimentaryrocks <strong>and</strong>sedimentsigneousrocks <strong>and</strong>sedimentscrystallineigneousrockscrystalline igneous rocks maycontain or consist of glass'normal'crystallinerocks'exotic'crystallinerockscoarse-grainedcrystalline rocksfine-grainedcrystalline rockscarbonatitesmeliliticrockskalsiliticrockskimberlitesmetamorphicrockslamproitesleuciticrockslamprophyresFigure 1 Hierarchical classification of igneous rocks <strong>and</strong> igneous sediments,Dashed lines with arrows connect major groups of rocks <strong>and</strong> sediments between which there is agradational 'boundary'. Dotted lines indicate that 'fragmental igneous rocks <strong>and</strong> sediments' may also oralternatively be classified within other schemes.27
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