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| Rock showing the influence of volcanic activity, on the coastline at Skerries. © Eugene Brennan |
Some
interesting rocks from the Loughshinny, Skerries, Balbriggan area I came across on a walk along the coastline. Also
a smuggler's cave I want to explore the next time I'm up there. I
presume the holes in the rock are from volcanic gases that made the rock
froth when it was molten. The white vein is a sedimentary layer that
ended up on its side when the strata became folded over horizontally (I
think that's what the GSI said when I asked them). Skerries is an area
of interest geologically because of the complex number of geological
formations from different periods. Further north at Clogherhead is one
end of the boundary between the northern and southern landmasses that
came together 470 million years ago to "make" the island of Ireland. That boundary line between the two
sections extends south westwards towards the Dingle Peninsula.
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| Vein in rock strata. © Eugene brennan |
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| Smuggler's cave near Loughshinny. © Eugene Brennan |
