Sounds like a bunch of schist to me! <wink>
--Bob
On Jul 8, 2012, at 11:12 AM, Piers Hemy wrote:
> No, not long at all. The Caledonian Orogeny is relatively recent - only 450
> million years ago (in round numbers). If you had come north last year I
> could have shown you some *really* old stuff (aside from a regularly used
> camera which is more than 60 years old) - rock from almost 3Ga ago (3
> thousand million years) at Oldshoremore:
>
> First, the beach:
> http://www.hemy.me.uk/img/P9132209.jpg
>
> Second, the cliff seen in the previous image, showing the characteristic mix
> of deeply twisted basaltic and granitic rock:
> http://www.hemy.me.uk/img/P9132211.jpg
>
> The background is explained here, courtesy of University of Oxford:
> http://tinyurl.com/AgeNWHighlands or, if you prefer a home-grown commentary,
> try here:
> http://epod.usra.edu/blog/2007/01/lewisian-gneiss-in-scotland.html
>
> As it happens, Oldshoremore is very close to Clachtoll, but the exposed rock
> there is much younger, only 1.2Ga old (!) of which I already posted this
> image:
> http://www.hemy.me.uk/img/Clachtoll.jpg
>
> Or maybe I misunderstood ;-)
>
--
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