History of Collyweston Stone
Collyweston stone slate is a fissile limestone from the Jurassic period (140-190 million years ago) and is not a true slate. It can be split along natural cleavage lines, however, which is the similarity between Collyweston and true slates. It is named after the village of Collyweston, in Northampton, which lies in the centre of the area in which the slate is quarried, and has been used as a roofing material since Roman times... keep reading
