Borrowdale Slate & Whitby Jet

The Borrowdale Volcanic Group is a development of volcanic rocks named after the Borrowdale area of the Lake District, in England. They are late Ordovician in age (roughly 450 million years old). It is thought that they represent the remains of a volcanic island arc, approximately similar to the island arcs of the west Pacific today. At that time the rocks that now comprise most of Scotland were not attached to England. They were separated by an ocean, called Iapetus Ocean by geologists. The line of joining, or suture, is approximately under the Solway Firth and Cheviot Hills. In the English Lake District, the Borrowdale Volcanic Group is composed of lavas, tuffs and agglomerates and slates, along with some major igneous intrusions. At the momment I am exclusively using slate from the Honister Slate mine in the Honister Pass south of Derwent Water as the texture, colour and hardness of the slate is excellent.

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