Dear John,
Northern Ireland's coast is of course replete with dykes and s
ills. Less well known is the Blind Rock Dyke on the north coast of
Donegal Bay. I bring this to your attention because its width, about
15 metres, appears to be exceptional in the context of Ireland. A
quick check of accessible literature suggests that dykes thicker than
4 metres are a rarity. This dyke is intruded into Lower Carboniferous
Bundoran Shale and extends for over a kilometre. Photos attached.
Best wishes
Malcolm.
Blind Rock Dyke
Nearby Bundoran Shale
On 12 Sep 2011, at 15:33, John F. Dewey wrote:
>> _Dear Colleagues,
>
> I am seeking out 100% exposed marine rock platforms where mafic
> dykes and their wall structures, and, ideally, relay/transform
> offsets, and terminations can be studied. I am seeking places where
> dykes were injected laterally away from volcanic centres and places
> where dykes were injected vertically beneath volcanic centres. I
> have visited a few spots in Arran, Mull, and Skye but I am looking
> for a lot more. Any help and suggestions will be greatly appreciated.
>
> Best wishes,
> John
>
>> _____________________________________________________
>>
>> ________________________________________________________________________
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> Prof. John F. Dewey FRS, M.R.I.A., FAA, Mem. Acad. Eur., Mem.
> US Nat. Acad. Sci., Distinguished Emeritus Professor University of
> California, Emeritus Professor and Supernumerary Fellow, University
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