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Gritstone orgrit is a hard, coarse-grained,siliceoussandstone. This term is especially applied to such sandstones that arequarried forbuilding material. British gritstone was used formillstones to mill flour, to grind wood into pulp for paper and forgrindstones to sharpen blades. "Grit" is often applied to sandstones composed of angularsand grains. It may commonly contain smallpebbles.[1]
"Millstone Grit" is an informal term for a succession of gritstones which are to be found in thePennines (including thePeak District) of northern England.[2] These sediments were laid down in the late (upper)Paleozoic era, in theCarboniferous period, indeltaic conditions. The Millstone Grit Group is a formalstratigraphic term for this sequence of rocks.
The gritstone edges of thePeak District are an important climbing area and the rock is much relished by Englishclimbers, among whom it has almost cult status and is often referred to as "God's own rock".[3] The rough surface provides outstanding friction, enabling climbers to stand on or grip the subtlest of features in the rock.
