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Kentish ragstone
Kentish ragstone is a hard grey limestone in Kent, England, drawn from the geological formation known as the Hythe Beds of the Lower Greensand. For centuries it has been quarried for use both locally and farther afield.
==Geology==
Ragstone occurs in a geological formation known in the Hythe Beds of the Lower Greensand, a layer of limestones running from Kent into Surrey which was laid down in the Cretaceous period. It outcrops in various places, notably at the cliffs of Hythe, Kent (whence it gets its name) and along the Greensand Ridge above the Weald of Kent. Ragstone occurs in bands between 15 cm and 60 cm thick, alternating with bands of a loose material called Hassock. These bands are of similar thickness and the difference in colour between them gives quarry faces a striped appearance. When the stone is extracted from the quarry, it appears to be of a grey green or blue grey colour but later weathers to an autumnal hue which, together with its hard-wearing properties, traditionally made it an attractive material for public building works.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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