Knowledge Centre

How old is slate?

Date : 20 December, 2020

The age of the slate stone varies depending on the regional geology.

For example, in Scotland, Ballachulish slate was formed from sediments laid down approximately 700 million years ago and was metamorphosed 500 million years ago. Spanish slate from the Orense area was formed from muds laid down over 450 million years ago and was metamorphosed 300 – 350 million years ago.


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