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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PhiunitsClast orcrystalsize in mm.Log scaleSedimentaryclastsVolcaniclasticfragmentsCrystalline rocks,igneous, metamorphicor sedimentaryboulders–8–625664cobblesGRAblocks<strong>and</strong>bombsvery–coarse–grainedvery–coarse–crystallineV–416pebblesElapilliLcoarse–grained–24coarse–crystallinegranules–12very–coarse–s<strong>and</strong>012310.5(1/2)0.25(1/4)0.125(1/8)coarse–s<strong>and</strong>medium–s<strong>and</strong>fine–s<strong>and</strong>very–fine–s<strong>and</strong>SANDcoarse–ash–grainsmedium–grainedmedium–crystallinefine–grainedfine–crystalline50.032(1/32)siltMUfine–ash–grainsvery–fine–grainedvery–fine–crystalline80.004(1/256)DclaycryptocrystallineFigure 3 British Geological Survey grain size scheme.29
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