sarsen stone

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sarsen stone Boulder or block of sediment consisting of a siliceous cement binding one of a range of materials, and found widely in south-eastern England, especially in the chalk country. Typical cemented components include angular quartz grains and rounded to angular flints (the ‘Hertfordshire puddingstone’). Sarsens are of early Tertiary age, and probably formed as a duricrust under tropical conditions.

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