English: A Scourie Dyke The line of dark rock cutting through the paler gneiss is a Scourie dyke. Scourie dykes were intruded between 2400 and 2200 million years ago into the Lewisian gneiss, which is at least 2700 million years old. This is a very narrow dyke, but they can be up to tens of metres in width. Notice how sharp the contact between the dyke and the country rock is.
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== {{int:filedesc}} == {{Information |description={{en|1=A Scourie Dyke The line of dark rock cutting through the paler gneiss is a Scourie dyke. Scourie dykes were intruded between 2400 and 2200 million years ago into the Lewisian gneiss, which is at lea
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