NM4962 : Shore near Mingary

taken 5 years ago, near to Kilchoan, Highland, Great Britain

Shore near Mingary
Shore near Mingary
Each of the ribs of rock running out to seaward is another cone sheet. In the distance is the north coast of the Isle of Mull.
Cone Sheets
Cone sheets are formed by magma penetrating arcuate cracks around the centre of a volcano as it subsides. Unlike ring-dykes, which dip outwards, cone sheets dip inwards towards a central point or focus.

West of Mingary Pier is a series of cone sheets which is one of the best examples, if not the single best example, in the world; a geological locality of international importance.

There are two swarms of cone sheets associated with Centre 2 of the Ardnamurchan volcano, one swarm older than the other. The individual sheets are quite thin, few being more than 6 metres thick, but adding them all together their total thickness is about 1300 metres - which gives an inkling of how numerous they are.

The cone sheets exposed west of Mingary dip at angles of about 35 to 45 towards a focus somewhere near Sonachan. They are mainly composed of quartz-dolerite or basalt, though some are composite and a few felsic sheets do exist. They cross, join and split off from one another, and are cut by later basic dykes.

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NM4962, 67 images   (more nearby )
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Date Taken
Saturday, 14 September, 2013   (more nearby)
Tuesday, 17 September, 2013
Geographical Context
Coastal  Geological interest 
Subject Location
OSGB36: geotagged! NM 4901 6283 [10m precision]
WGS84: 56:41.3744N 6:6.0294W
Camera Location
OSGB36: geotagged! NM 4909 6290
View Direction
Southwest (about 225 degrees)
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Image classification(about): Geograph
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